sureflow 3.5 thinking of getting

[Gts.300]

Can anyone tell me the layout of the 3.5 cat back system and does it bolt up same as of shelf? Also rough price?

[vuss383]

Best to speak to Greg direct . Very well fitting units & sound tough !!


Troy

[sv300 - 75]

mate it fits up nicely, not much mods needed to get it to fit, very minor.
the layout or configuration of the system changes from loud to medium so you are best to speak to greg from sureflo

[Stevieboy34]

From a personal note, I would urge you NOT to get one. I had one and it was terrible. I made considerable more power going to a duel system but it sounded way better.

[Millsy]

I would urge TO get one. I have a LOUD on my H/C 5.7 and with 315rwkw on a Mainline, proves they have no issues making power

A single 3.5" flows more than a twin 2.5" hence why some people make more power in 'bolt on' applications were the extra flow of bigger cams/heads etc isnt an issue

Greg says they max out at 400rwkw so I will be testing this claim with twin turbos in the coming months ;)

$680 for the cat-back in mild steel and it sounds like a V8 Supercar with NO DRONE!!! :D

They are twin 2.5" into single 3.5" and are a direct bolt on for all VT-VZ models, however some people have issues with the rear resi as they do not know how to follow instructions...

Only fault, 'surface rust'. Nothing a rub down and some paint can't fix thought

Hope this helps

Cheers,

Millsy

[Stevieboy34]

I guess to explain myself further I had the mounting point break and it had to be replace no less than 4 times in 3 years. IMO it sounded like a drony 6 cylinder most of the time unless you were up it, idle wasnt too bad but I also got a set of headers too which were shorty little things, I remember being amazed at a dyno figure of 189 RWKW. Back to back with a duel 3 inch xforce system it went to 228 RWKW same day same dyno NO tune.
Not trying to bag him personally as I have no doubt he can build a decent exhaust but I would be steering clear of the 3.5.

[Wonky]

I know plenty of guys with 3.5" Sureflo and they sound tougher than any dual 2.5" I've heard. Millsy's is super tough! :drool: A mate of mine put one on his VX SS A4 a few months ago, as well as VY2 extractors, Ballistic cats, DUS OTR and Chev tune and went from 180rwkw (with droney old catback) to 230rwkw and is absolutely rapt with the sound and performance!! Absolutely no drone either, something he had in spades with his old catback.

For the technically inclined the surface area of a 3.5" pipe is 12.25 sq inches. For a 2.5" pipe it's 6.25 sq inches, so a 3.5" system flows virtually the same as a dual 2.5" (6.25 x 2 = 12.5 sq inches).

My daughter was after a new catback for her VY V8 Berlina and we really wanted the Sureflo 3.5" but her car is so low (SSSL) that she would have quickly killed it on the dirt roads and speed humps around here, so had to go dual 2.5". :(

[feistl]

$680 for the cat-back in mild steel and it sounds like a V8 Supercar with NO DRONE!!! :D

With all due respect, please refrain from comments like these. While yes, the exchange system may sound good, there is no way on earth a stock motor with a cat back exhaust is going to sound anythink like a V8 supercar. Ive heard stroked LS3s with custom twin 3" systems (no cats) that sound amazing, but still nothing like a V8 supercar.

Unless your running a stupidly large cam with very low LSA, 8TB intake and very high compression its not really going to sound like a V8 supercar.

Dont mean to nit-pick, just ive seen a number of people making comparisons thats not really accurate.

[Rub]

With all due respect, please refrain from comments like these. While yes, the exchange system may sound good, there is no way on earth a stock motor with a cat back exhaust is going to sound anythink like a V8 supercar. Ive heard stroked LS3s with custom twin 3" systems (no cats) that sound amazing, but still nothing like a V8 supercar.

Unless your running a stupidly large cam with very low LSA, 8TB intake and very high compression its not really going to sound like a V8 supercar.

Dont mean to nit-pick, just ive seen a number of people making comparisons thats not really accurate.


Shut up and stop nit-picking...

Sureflo single 3 1/2" exhaust sound amazing..

GET IT...

STOP ASKING QUESTIONS...

DO IT....

[255-LS1]

guys guys calm lol

as they say one mans trash is anothers treasure...

there is no such thing as the "best exhaust" it just doesn't happen, some like this some like that. you really need to hear them in real life to decide if you like it or not.

Oh and there has been some power / 1/4 mile tests by reputable exhaust shops where the 3.5" single wound up in the bin in favour of a dual 3".

Each to there own but.

[Wonky]

Oh and there has been some power / 1/4 mile tests by reputable exhaust shops where the 3.5" single wound up in the bin in favour of a dual 3".

Of course it would, presuming it needed the flow. As I said above, the single 3.5" has a surface area of 12.25 sq inches. A dual 3" has 18 sq inches, so obviously flows much more. From what I've read a dual 3" will most likely be too much on a bolt on LS1 for instance and cause it too lose low down power and torque.

[Stevieboy34]

To the OP. before making a decision on spending your hard earned, as someone said here earlier. Listen to BOTH and make your mind up. Not on a youtube clip, at a shop... Make your own mind up mate.

[Wonky]

To the OP. before making a decision on spending your hard earned, as someone said here earlier. Listen to BOTH and make your mind up. Not on a youtube clip, at a shop... Make your own mind up mate.

+1 Always best to listen in person, both from outside and inside the car. :yup: If the OP says roughly where he lives maybe people with the Sureflo who live in the area can accommodate him.

[STATIE]

Personally - never heard a single system that sounded good on an LSX & never seen one go fast either - that's enough for me.

Sound good on the old 308's though.

[HSVREDSLED]

I have one...couldn't be happier. Nice and tame when you want...growls when you want.

Ride height is great.

[LS1FRK]

This system sounds fantastic! Mine needed a fair amount of modification to fit, so it's not exactly a bolt-on replacement.

The system never drones and was a great upgrade as a cat-back only system, however it really came into it's own once Tri-Ys and high-flow cats were put in front of it.

[macca33]

I've experienced a Sureflo single 3.5" system on a head/cam car, bolt-on and cam-only car and they always sounded great.

Admittedly, DiFilippo has been my choice of exhaust, but I would heartily recommend Sureflo to anyone who wants a tough sounding system that delivers as it promises.

cheers

[vr5speedv6]

Personally - never heard a single system that sounded good on an LSX & never seen one go fast either - that's enough for me.

Sound good on the old 308's though.

Agreed. They just don't deliver that low rpm v8 thump like a twin system and can end up sounding like a 6 at certain rpm.

[HSVREDSLED]

Agreed. They just don't deliver that low rpm v8 thump like a twin system and can end up sounding like a 6 at certain rpm.

I can assure you, that after 210,000kms of driving over the past 8 years with a 3.5 sureflo Medium system..... it never sounded like a 6 at any rev between 750 and 6500rpm.

[Wonky]

I can assure you, that after 210,000kms of driving over the past 8 years with a 3.5 sureflo Medium system..... it never sounded like a 6 at any rev between 750 and 6500rpm.

I agree :yup: having heard plenty of Sureflo 3.5" and various dual 2.5" systems on LS1s. The Sureflo sounded tougher than all the others with the possible exception of DF dual 2.5" which sounds good in a slightly different way, but much more expensive.

[Millsy]

That's because they haven't heard mine yet Wonks ;)

I don't care if I'm biased but I reckon mine is THE tuffest sounding H/C LS1 (346) full stop

Don't knock it until you've heard it

Cheers,

Millsy

[BLACK 346]

Another non fan here. Had the 3.5 Medium fitted just prior to our trip down from Darwin to Adelaide. Sounded pretty good on the bolt on LS1 compared to the Redback 2.5 twin it replaced. Was really pleasant for the trip as it had no drone and the note was definitely where you wanted it, out the back of the car, not in the cabin. Now the down side. It never really had that distinctive V8 note, deep yes, but not really V8 imo. It also rusted out very quickly. And the killer for me, when I put the cam in it sounded horrible :bawl:
Sold it for $100, and went Twin 3 inch. Just my experience. As said above, listen to all options in person if possible and make the correct decision first time around. I didn't.

[Ruiner]

gotta sound better then a x-force dual 2.5" system. Thats the path im going down since Greg had a great deal going, 3.5" single quiet system though

[WLDLS1]

Personally - never heard a single system that sounded good on an LSX & never seen one go fast either - that's enough for me.

Sound good on the old 308's though.

im with you greg.
i had a single on my old vt ss years ago. a corsa built and it was crap.
we went twin 2.5 and up came the power and it sounded tops.
i had a custom made twin 2.5 with no cats on the old WLDLS1 and it had a sound that i have never heard again anywhere.
it was a one of a kind . tough and no drone.

[Wonky]

i had a single on my old vt ss years ago. a corsa built and it was crap. we went twin 2.5 and up came the power and it sounded tops.

3" or 3.5"? :confused:

The only 3.5" I'm aware of is the Sureflo so assuming it was only a 3" it's quite understandable that the power increased with the dual 2.5" as you more than doubled the flow. However, even though it's only a seemingly small difference from 3" to 3.5" it actually also more than doubles the flow to almost the same as a dual 2.5". In fact a flow expert would possibly even draw the conclusion that a single 3.5" would flow better than dual 2.5" due to less eddying and restrictions in a single pipe??? :confused:

At the end of the day I don't really give a FF what the OP gets and I know nothing of longevity given I've never had one myself - all I'm saying from hearing quite a few is that the Sureflo 3.5" systems sound the toughest I've heard on LS1. :)

[WLDLS1]

3" or 3.5"? :confused:

The only 3.5" I'm aware of is the Sureflo so assuming it was only a 3" it's quite understandable that the power increased with the dual 2.5" as you more than doubled the flow. However, even though it's only a seemingly small difference from 3" to 3.5" it actually also more than doubles the flow to almost the same as a dual 2.5". In fact a flow expert would possibly even draw the conclusion that a single 3.5" would flow better than dual 2.5" due to less eddying and restrictions in a single pipe??? :confused:

At the end of the day I don't really give a FF what the OP gets and I know nothing of longevity given I've never had one myself - all I'm saying from hearing quite a few is that the Sureflo 3.5" systems sound the toughest I've heard on LS1. :)
gday Wonks. hows it going. well i hope. i think it was 3 inch. was a long time ago.
i should also state pete did a top job on the exhaust. nothing against him. it just didnt work so we give it the flick.

[HSVREDSLED]

Another non fan here. Had the 3.5 Medium fitted just prior to our trip down from Darwin to Adelaide. Sounded pretty good on the bolt on LS1 compared to the Redback 2.5 twin it replaced. Was really pleasant for the trip as it had no drone and the note was definitely where you wanted it, out the back of the car, not in the cabin. Now the down side. It never really had that distinctive V8 note, deep yes, but not really V8 imo. It also rusted out very quickly. And the killer for me, when I put the cam in it sounded horrible :bawl:
Sold it for $100, and went Twin 3 inch. Just my experience. As said above, listen to all options in person if possible and make the correct decision first time around. I didn't.

Interesting about the rust out issue. I have the non stainless version and live withing 300 metres of breaking surf. Leave a screwdriver out overnight and it rusts. The car is out every night and system still going strong 8 years on.

[BLACK 346]

Interesting about the rust out issue. I have the non stainless version and live withing 300 metres of breaking surf. Leave a screwdriver out overnight and it rusts. The car is out every night and system still going strong 8 years on.

Rusted out is probably an overstatement, but for the age of the exhaust it was certainly coated in rust head to toe.

[willz]

I just fitted one approx 3 weeks ago. I ordered a twin 3 to single 3.5 in stainless.

Fitted it up by myself with no modifications. For something produced elsewhere the fitment of the flanges and clearance to the car itself was fine. No rattles etc.

Sounds great to me, its exactly what i wanted.

Sound is so subjective and you would have to have rocks in your head to purchase an exhaust without listening to one in the flesh. Find someone in your area with the exhaust you want and go for a ride in it.

[vr5speedv6]

I can assure you, that after 210,000kms of driving over the past 8 years with a 3.5 sureflo Medium system..... it never sounded like a 6 at any rev between 750 and 6500rpm.

I suppose it's a fairly subjective thing, but I noticed the lack of v8 note in the cabin between 1500-2000 rpm where you could've thought you were driving a 6. As soon as I put on the xforce twin 3" it brought back that chop to it.
It's now even more noticable that I've gone with a Hpipe.
Also after a few weeks most of the paint had burnt off the sureflo, so sounds like you got the good paint on yours!

[daztheclipper]

That's because they haven't heard mine yet Wonks ;)

I don't care if I'm biased but I reckon mine is THE tuffest sounding H/C LS1 (346) full stop

Don't knock it until you've heard it

Cheers,

Millsy

+1 for Road Salmons baby, very nice sound indeed, didn't know it was Sureflo but it sure is da nuts! ;)


Sent via IPhone
Daz

[added]

Sounds great.
Mine needed fairly extensive modification to fit properly.
Don't expect help from the manufacturer if you have an issue with it.

[macca33]

Sounds great.
Mine needed fairly extensive modification to fit properly.
Don't expect help from the manufacturer if you have an issue with it.


This has been mentioned at least twice in this thread and also in others, yet nobody wants to declare the EXACT nature of their issue.

Was it a failure in design / construction, or the person who fitted the system? All the 3.5s I've seen looked quite easy to fit.

Can someone please enlighten us with facts, not conjecture...

[RAWKUS]

Am quite keen about going down the path of fitting the 3.5 to my wife's Adventra. Will get a Mailorder tune and sort the intake out too, but not after all out performance so may retain the stock manifolds and cats. Main aim is economy and V8 note. Car will go plenty hard enough for wifey duties, taxi for me :goodtime::booze: and towing when required.
Would be keen to hear another member's system on their Avalanche or Adventra to help me make up my mind (around Melbourne Southern suburbs or Peninsula).
With the outer rusting issue, get the exhaust delivered unpainted and coat it yourself with Pot Belly black paint. It's more of a brownish/black colour but goes hard as hell and prevents rusting when baked as this is what it is designed for on your woodheaters etc. Pretty sure it's ceramic impregnated too. :goodjob:

[Souljah]

My Sureflo rusted out within 3 years. The whole back section where it dips under the driveshaft was replaced. You could put your finger through the holes by the time i had it fixed. Rest of the system was ok for rust though.



With the outer rusting issue, get the exhaust delivered unpainted and coat it yourself with Pot Belly black paint. It's more of a brownish/black colour but goes hard as hell and prevents rusting when baked as this is what it is designed for on your woodheaters etc. Pretty sure it's ceramic impregnated too. :goodjob:

Paint it in what ever you like but you will find that exhaust systems rust from the inside out.

[Girvo]

I have a sureflo 3.5" on my ls1, with 100cpi cats and 4-1 pacemakers.

Sounds absolutely amazing!!!! When I had her tuned, I quite nearly cracked a fat, it was the most amazing thing I've ever heard.

Seriously cannot reccomend them enough

[Stevieboy34]

I suppose it's a fairly subjective thing, but I noticed the lack of v8 note in the cabin between 1500-2000 rpm where you could've thought you were driving a 6. As soon as I put on the xforce twin 3" it brought back that chop to it.
It's now even more noticable that I've gone with a Hpipe.
Also after a few weeks most of the paint had burnt off the sureflo, so sounds like you got the good paint on yours!

I agree 100%. I thought it was pretty cool until I went for a drive in a car with a proper duel system. That exact rev range your talking about did (in mine at least) sound like a drony 6. No "purr".

As I mentioned to the OP, drive BOTH and choose what you are after, I can honestly say if you are after a 3.5 inch you can probably get one v cheap second hand, I would have given you mine bud.

[LS1FRK]

This has been mentioned at least twice in this thread and also in others, yet nobody wants to declare the EXACT nature of their issue.

Was it a failure in design / construction, or the person who fitted the system? All the 3.5s I've seen looked quite easy to fit.

Can someone please enlighten us with facts, not conjecture...

I've had mine on the car a while, so my recollection is a bit rusty - all I remember is that to get the tip sitting nicely in the bumper bar cutout the hangers had to be bent substantially.

In addition, the exit pipe from the rear muffler had to be cut off, angled and welded back on. No matter how the guy at the exhaust shop tried to twist it around the axle join it ended up pointing either directly at the ground or out the side of the bumper.

And before anyone starts doubting the exhaust shop, I've had three systems fitted previously (to all sorts of vehicles) without issue.

[Auspeed]

For what's it's worth, it was when I heard a sureflo 3.5 on a tuned L98 that I approached Greg to supply a custom one for my xr8, I got so much feedback from ford fanatics of how good it sounded.... This was on my family car too..

The main point is that the exhausts are designed not to drone at the low flow rpms for highways which so many people look for now days...

3.5 " will be more than enough in 98% of NA applications

[added]

This has been mentioned at least twice in this thread and also in others, yet nobody wants to declare the EXACT nature of their issue.

Was it a failure in design / construction, or the person who fitted the system? All the 3.5s I've seen looked quite easy to fit.

Can someone please enlighten us with facts, not conjecture...

Flanges were warped in a concave fashion - new flanges.
Pipework extended past the the flanges at joins - grinder (except the flanges had to be redone).
Rear section was hanging far too low and was only a few inches off the ground despite using the method Greg advised - modification of mounting points on car and on the exhaust.
Cat sections didn't fit - Heated and bent to fit.
[B]"Y" Section before the centre muffler was too narrow[B] - Heated and bent to fit.
Hasn't rusted, but it is S/S so i don't expect it to

When you spend that much on an exhaust and you are told it will all bolt up sweet and there are that many problems with it... When it came to getting recompense i was basically given the run around and after the 5th email couldn't be bothered following it up.

:goodjob:

[vr5speedv6]

I agree 100%. I thought it was pretty cool until I went for a drive in a car with a proper duel system. That exact rev range your talking about did (in mine at least) sound like a drony 6. No "purr".

As I mentioned to the OP, drive BOTH and choose what you are after, I can honestly say if you are after a 3.5 inch you can probably get one v cheap second hand, I would have given you mine bud.

For sure, twins are the only way to go on a v8 IMO:goodjob:

[michaels1v8]

As can be seen, exhaust taste is very subjective. Best thing you can do is get out and listen to a few systems and make up your own mind. My sureflo has been on 4 years now and was fitted quite easily by a chump that knows nothing about cars. I like the sound of it and in the end thats all that really matters. I've also been happy with greg's service after having dealt with him on 5 separate occasions for exhaust purchases.

[TUFFIE]

I ve had 2 sureflow 3.5 systems on my cars, first on my VX (loud system)had it on there for over 5 yrs, no rust, fitted perfectly and all my questions answered by Greg, No dramas at all.

Second on the Grange been on for over 12 months now (Quiet system) currently pushing 365 Kw through it, No, rust fitted perfect and 101 questions answered by Greg.

I have no more to say.:eyes:

[vr5speedv6]

I ve had 2 sureflow 3.5 systems on my cars, first on my VX (loud system)had it on there for over 5 yrs, no rust, fitted perfectly and all my questions answered by Greg, No dramas at all.

Second on the Grange been on for over 12 months now (Quiet system) currently pushing 365 Kw through it, No, rust fitted perfect and 101 questions answered by Greg.

I have no more to say.:eyes:

Are they still press bent on the 2.5" sections? If so, I'd think that'd be a bit of a restriction point

[SirNemesis]

TUFFIE is making 365rwkw. I'm quite sure if there are any restrictions they wouldn't be very noticable for any car that isn't extreme...

[vr5speedv6]

TUFFIE is making 365rwkw. I'm quite sure if there are any restrictions they wouldn't be very noticable for any car that isn't extreme...

I've heard of a few people picking up a few kw on bolt-on cars after switching, so i'm thinking tuffie could be missing out on a few kw there.
But im sure he's happy with 365 anyway!!

[TUFFIE]

I've heard of a few people picking up a few kw on bolt-on cars after switching, so i'm thinking tuffie could be missing out on a few kw there.
But im sure he's happy with 365 anyway!!

Cheers for the heads up, But I will not be changing a thing on this exhaust at the risk of changing the note for anything other than what I have now, if that means losing a few Kw's so be it. The Note for me is just perfect.:bow:

[vr5speedv6]

Cheers for the heads up, But I will not be changing a thing on this exhaust at the risk of changing the note for anything other than what I have now, if that means losing a few Kw's so be it. The Note for me is just perfect.:bow:

Yes I think 365rwkw should be adequate:eyes:

[daztheclipper]

Cheers for the heads up, But I will not be changing a thing on this exhaust at the risk of changing the note for anything other than what I have now, if that means losing a few Kw's so be it. The Note for me is just perfect.:bow:

TUFFIEs car is really nice sounding, quiet at idle which I kinda like personally, but all the rite noises at WOT! And goes like stink as my poor old NA 6 litre can vouch for! An absolute beast, great sound and great power! ;)


Sent via IPhone
Daz

[LS1FRK]

Flanges were warped in a concave fashion - new flanges.
Pipework extended past the the flanges at joins - grinder (except the flanges had to be redone).
Rear section was hanging far too low and was only a few inches off the ground despite using the method Greg advised - modification of mounting points on car and on the exhaust.
Cat sections didn't fit - Heated and bent to fit.
[B]"Y" Section before the centre muffler was too narrow[B] - Heated and bent to fit.
Hasn't rusted, but it is S/S so i don't expect it to

When you spend that much on an exhaust and you are told it will all bolt up sweet and there are that many problems with it... When it came to getting recompense i was basically given the run around and after the 5th email couldn't be bothered following it up.

:goodjob:

Mine also required heating and bending near the cats now that you mention it - it cost me an extra $80 in labour overall to get it sitting properly on the vehicle. I had a similar issue with after-sales support - it was basically suggested that my choice of exhaust fitter was not fit for the job (he's been in the game for 15 years).

It's almost a pity the system sounds so good, as it would be easier to tell people to steer clear. Put it this way, it's a great system but it certainly isn't simply a matter of bolting it on.

[Millsy]

No issues with mine, your mechanics are all sh*t :hide:

:D

[DAVZSS]

Never had a problem whilst fitting by myself on the floor in the garage at night with a dolphin torch by my side.

It was a direct fit no mods needed,I did however go to an exhaust place to have the twin 3" outlet welded on.

And most of all I love it:)

David

[Wonky]

FWIW I watched Jeff (vxr8red) and Graham the welder at Chev's fit a full Sureflo 3.5" system (Sureflo shorty headers and Ballistic cats) to Jeff's R8 today. It took a while but mainly because they were in no hurry and were double checking everything. From what I saw the only "complications" were due to the fact Greg now seems to design them with flexibility in mind, particularly at the rear where you have to measure where to cut off the tailpipe so the tips finish where you want and also in the rear hanger setup. The rear muffler was HUGE as now with cam his previous system was quite loud and the cops are getting deadly around our area now, so he went for their Quiet system. Once it carbons up and with the cam I reckon it will sound great without being over the top.

From what I saw, apart from cutting the tailpipe to length there was no modification required apart from a few small taps but they may have been just making sure everything was seated properly??? Sorry for the quality but I only had my phone with me.

http://i122.photobucket.com/albums/o274/gcovo/Misc/Jeffsexhaust002sm.jpg
http://i122.photobucket.com/albums/o274/gcovo/Misc/Jeffsexhaust004sm.jpg

[Sime]

These things are going to sound different depending on what you do with the rest of the exhaust. There's no point saying your mates car sounds ace if he also has the cats and headers done as it's going to sound different to someone who just has te cat back.

I had a medium loud cat back on an auto VZ Clubby and it was garbage. It had the 6cyl sound that others have mentioned. It was also covered in rust after 3 months. Once you factor in dual tips, installation, and delivery these systems are $900. Pretty expensive so you'd want to make sure you're going to be happy with it. Many people are but some people aren't.

[TUFFIE]

These things are going to sound different depending on what you do with the rest of the exhaust. There's no point saying your mates car sounds ace if he also has the cats and headers done as it's going to sound different to someone who just has te cat back.

I had a medium loud cat back on an auto VZ Clubby and it was garbage. It had the 6cyl sound that others have mentioned. It was also covered in rust after 3 months. Once you factor in dual tips, installation, and delivery these systems are $900. Pretty expensive so you'd want to make sure you're going to be happy with it. Many people are but some people aren't.

The Med Loud for an Auto....is that what what Greg from sureflo recommended? or was that your choice?
From my experience with Greg you tell him what car you have M6, Auto etc and what mods are done to it and he will recommend a system to suite, if you go outside of that and it is not to your liking, is that the systems fault? or yours? Did you get rid of the system? or did you keep it?
Dunno about you but delivery only cost $60 and fitting was free as its easy enough to do yourself.
Anyway I guess its like which OIL to use, everone has different opinions.

[B1n0ry]

I can recommend the Sureflo single 3.5"
Fitted to my VY SV8 (manual).
I can't say anything about fitment issues, because I had it put on at Sureflo themselves, but it took them less than half an hour to fit it, and that included putting on the tips.
I get no droning and no flat "6 cylinder" sound at any revs.
Other mods are DUS OTRCAI, pacemaker Tri-Y's, Ballistic cats, plus the 3.5 (the quiet one, with the huge rear muffler)
Oh, it also has mafless tune and 3.91 diff gears.

[jamit]

+1 for the Sureflo 3.5" system. I have had one (Med system) fitted to my Crewman for about 12 months and have only positive comments on how it sounds. Fitted it myself in the carport no drama's at all. I also had great pre and post support for Greg.

Also fitted 4--> 1 long extractors and ballistic cats.

[TUFFIE]

These things are going to sound different depending on what you do with the rest of the exhaust. There's no point saying your mates car sounds ace if he also has the cats and headers done as it's going to sound different to someone who just has te cat back.

I had a medium loud cat back on an auto VZ Clubby and it was garbage. It had the 6cyl sound that others have mentioned. It was also covered in rust after 3 months. Once you factor in dual tips, installation, and delivery these systems are $900. Pretty expensive so you'd want to make sure you're going to be happy with it. Many people are but some people aren't.

Exhaust note is a very subjective matter mate (like oil)..but you must take note of all the positive comments compared to the very few negative comment re the note..

As for the Rust, surface rust is a whole different thing to the system actually rusting out, a bit of trivia for you Exhausts dont rust from the outside in. They rust from the inside out.

[v8fazz]

I have been considering this system as well. I would be interested to hear peoples opinions on the comparisons between the loud, medium loud, medium, and quiet systems.

Also opinions on using the single 3.5" with the Sureflo short headers and Ballistic cats as this is what I was thinking of going with, rather than just a cat back system-

Sureflo short 4>1 headers, 2.5" pipes from headers to cats, 4" Ballistic cats, and 3.5" cat back. Was thinking of going with the medium but interested to hear peoples thoughts if they have this set up. (VY M6)

[SSer]

Ive got a Sureflo 3.5" too on the VX, with Pacemaker tri-y's and stock cats. I love the sound it makes, especially at idle. The misses thinks its a bit loud (not sure what noise level I got). It was droning a bit at highway speeds before I put the Pacemakers in, not sure if thats the norm or not.

I wouldnt hesitate on getting another one (and some of Gregs ballistic cats).

[Ruiner]

Ive got a one of Sureflow's 3.5" single quiet system on the Calais with 1 3/4" staino shorty extractors with Ballistic cats.
Compared to my old X-Force system, it has a much smoother/deeper note with no raspyness
Around 2-2.5k RPM the note 'blends' together so it doesnt really sound like anything, but at 3k to WOT, just a great V8 note

[Peter B - CV8]

Ive got a one of Sureflow's 3.5" single quiet system on the Calais with 1 3/4" staino shorty extractors with Ballistic cats.
Compared to my old X-Force system, it has a much smoother/deeper note with no raspyness
Around 2-2.5k RPM the note 'blends' together so it doesnt really sound like anything, but at 3k to WOT, just a great V8 note

Exactly the same system as mine :) Absolutely no drone, slightly deeper/tougher sounding at idle & up to around 2,000rpm - V8 super car sounding from 3000rpm upwards.
My system has been on the car for approx 3 years & I've had absolutely no problems/issues. I did however nip up the manifold bolts a couple of weeks after install.

[BLACK 346]

Around 2-2.5k RPM the note 'blends' together so it doesnt really sound like anything

One of the reasons I ditched mine and went back to a twin system. You just dont spend that much time above 3k on the street, well I dont anyway.

[BradSV8]

I have had a stainless 3.5 on mine for around 5 years and 100,000 km's. I have made just over 400rwkw with mine and run a 10.6 with it on the car. I pulled it off a few weeks ago due to being defected and with a quick rub it came up like a mirror again... no complaints here.

[Ruiner]

One of the reasons I ditched mine and went back to a twin system. You just dont spend that much time above 3k on the street, well I dont anyway.

I know what you mean, but I didnt want to hear a V8 note every time I took off from a stop normally. Suit the manners of a Calais perfectly IMHO.
But if i had a GTS or something, I'd get something louder/crazier

[Gts.300]

Nice to hear all posts, must be a nice system but I got offered a second hand di filippo twin 2 1/2 and with a coat of paint come up pretty good , as for sound you have to hear it!!! Words can't really describe it whilst mated to 1 3/4 pacemakers and hiflow cats on an ls1.

[BLACK 346]

I know what you mean, but I didnt want to hear a V8 note every time I took off from a stop normally. Suit the manners of a Calais perfectly IMHO.
But if i had a GTS or something, I'd get something louder/crazier

Good point, would be the perfect match for a Calais.

[Thunder]

Hi Guys,
Someone sent me a link to this thread and is confused from all the opinions.
Hopefully this helps everyone understand the 3.5" system.

Product Improvements:

1. PERFORMANCE: Previously the front twin 2.5" pipes were press bent so that they were made from aluminised steel.
There was only one bend in each pipe, so the restriction was minimal, but now they are 2.5" mandrel bent aluminised steel.

The stainless systems were always mandrel bent.

2. RUST: Most mild steel mandrel bent sports systems are bare metal and painted, so are mild steel extractors.
They mainly rust from the inside, as that is where the corrosive moisture is, but they do surface rust on the outside when the paint burns off.

3.5" is a wierd size and near impossible to get in aluminised.
For the last 12 months on utes, and last few months on sedans, we have been making the entire system from aluminised steel, even the mufflers and hotdogs.

Therefore, when some say the system is rusting, it is an older system.
These bends are hard to get in aluminised, so we can't guarantee all systems will be like this, but we will endeavour to not run out.

The 3.5" systems are still the same price they were several years ago, but they are now completely made from aluminised steel, and are completely mandrel bent.

3. SOUND:
Our Ballistic 100cpsi Racing cats make a big difference to the sound of the 3.5" system, or any sports system for that matter.

Drone: Anyone can make a loud exhaust system, and some are louder and boomier on the inside than they are on the outside.
The skill is to make them loud on the outside, loud under acceleration, deep idle, but go quiet inside the car when cruising at freeway speeds.
The majority of people have bought these cars to have a new car feel, yet a droning exhaust system makes driving it unpleasant, so that is why these exhaust systems are great. Noise when you want it, and cruise in peace.

Over the years we have had a few unhappy customers, and they haven't been happy until we made the exhaust drone on the inside for them.
We stood them on the footpath and then drove past to show them how loud it is outside, and some decide it is loud enough and others want it louder.
Some people don't think the exhaust is loud until it drones inside and makes their ears bleed.
Everyone has different tastes.



V8 Supercar growl:
A couple of people took offense at this analogy.
Over the years several cars with loud 3.5" systems have taken to the track and several have been told that the exhaust on their car actually sounds better than the V8 supercars that were also practising on the track the same day. Again, this is personal taste.

There is an RX7 with a cammed 6.0 litre LS2 that has our custom extractors, (no cats) and a 3.5" system and it did a 1.01 sec lap at Wakefield which is faster than the Porsche Cup lap records. This didn't have cats as it is a race car, but the Ballistic 100cpsi Racing Cats would still give a similar note.

<iframe width="420" height="315" src="https://www.youtube.com/embed/iql5dVsqCpE" frameborder="0" allowfullscreen></iframe>

Direct Link, just in case this doesn't work: http://youtu.be/iql5dVsqCpE

Fitment:
There have been a couple of people that say they had fitment problems over the years.
Although I don't recall these specific problems, when we are advised, we check our jigs and fix them if there is a problem.
All the systems are made in the same jigs, so unless there was a problem with the jig, damage in transport, or other problems, it is hard to say.
We fit these same systems day in, day out, so if there is a problem we fix it as soon as we know about it.

Sometimes the problem is with the brand of extractors and cats chosen, as they don't line up in the factory position.
I remember one complaint where this happened, and the OE Holden system wouldn't bolt up either.
I remember a mechanic having problems with a 1 tonner. They have a live axle, so the diff moves up and down, yet he was trying to fit the system on a 2 post hoist.
A customer took our VE system to a Muffler Shop and the muffler shop fitted the front section upside down and told the customer it was crap, and then sold him a custom made system and returned ours for a refund.

There are usually less problems with customers fitting our systems themselves.
The systems come with instructions, and the customers usually read and follow the instructions.


<iframe width="420" height="315" src="https://www.youtube.com/embed/vCE-WeziR6w" frameborder="0" allowfullscreen></iframe>

Direct Code, just in case this doesn't work: http://youtu.be/vCE-WeziR6w

Power:
As discussed earlier, the 3.5" has a fractionally smaller cross sectional area, so if the engine is tuned to it, then you will get slightly better low down performance and the same mid range power. The 3.5" as it is a single pipe, has a smaller surface area than a dual 2.5" system - ie there is less surface area that the gas comes into contact with, and therefore, there is less frictional loss. This means the system has a fair bit more power up top.

Most testing is done on different cars and without the tune being changed to suit.
We had a customer come in that had been to Sam's Performance for a dual 2.5" Redback system and a mafless tune.
He didn't like the sound and 3 days later we fitted a 3.5" system to his car.
He came back a couple of weeks later and gave us a copy of the dyno sheet.
After he left here, he got Sam to touch up the tune for him.

Therefore, this dyno sheet is totally independent.
The car was tuned to suit each system and dynoed.

http://i122.photobucket.com/albums/o259/Sureflo/Dyno35vs25-1.jpg


If you do a Youtube or Google search on Sureflo 3.5" you will see plenty of video clips of these systems.


Everyone has different tastes, so this system will not satisfy everyone.
The system comes in different loudnesses, and yes, we can even make them drone if that's what you want.
Power - well, independednt dyno sheets mean more to me than a dyno sheet I did myself, so you be the judge.
Fitment - there haven't been many problems over the years, and usually if there is a problem it can be rectified easily.
If a customer can fit the system lying on the floor under the car, I can't see why any workshop with hoists and the proper tools would have any problems.

I hope this helps

Cheers
Greg

[Beepa]

I've had mine on the vx for over a year now, bolted on without any problems, no drone and sounds great!! Can scrape now and then but that is more my fault than the exhaust.

[Thunder]

The other thing I forgot to mention, is the 3.5" pipe that goes from the front muffler to the back muffler is also now one piece in aluminised steel.
Therefore no welded joints, so it looks better as well.

http://i122.photobucket.com/albums/o259/Sureflo/P1010251t-1.jpg

Cheers
Greg