Are extractors a must????

[Dover]

Ive got a vy2 ss ute,
Im gonna get the exhaust done by taipan exhaust on the goldie.
Holden said i gotta keep the cats in the original position to avoid warranty issues.. So are the short hpc headers worth the high hunderds they cost??
Im definatly getting the stainless cat back and a edit at power torque.
Honestly would there be a massive power difference between no headers and headers at the end of it? These will be my only mods as i only really brought the car for work.

Thanks heaps
Ben

[seldo]

Save yer dough.

[DaveHAT]

So is it better leave the stock headers with catback exhaust, & spend the extractor money on an edit? :confused:

[cheffy]

Ive seen varing results in the exractor department. if your going to get an edit it is well worth the extra $ to put extractors on as well..... Get the larger 4-1 pacemakers 1-3/4 and enjoy.

[MNR-0]

I have the short 4-1 extractors mated to the stock VYII cats under the bonnet. Its worth around 8rwkw properly tuned.

[Dover]

I have the short 4-1 extractors mated to the stock VYII cats under the bonnet. Its worth around 8rwkw properly tuned.

So in your opinion are the 8 kw worth the extra coin? Or would you get the headers again if you had your time again??

[jneil]

I went the Pacemaker Tri-y's with 2.5" high flow cats and a Di Filippo 2.5" cat back...K&N (with 2nd hole), 4" MAF pipe and a MAF Edit...237rwkw at the 4000km mark. I will hopefully be able to crack 240rwkw with the 2nd tune at the 10000km mark....it is still running a little rich until it runs in/loosens up a bit more.

MNR-O: Just out of curiosity, what is your peak power with the 2.25" and the shorty headers??

Jeff.

[snowySS]

Ben,

I have a VY series 2 ute M6.

After around 6000km's I went to Sam's and got a mafless edit and 3.91 diff gears. Everything else is stock, except for a K&N air filter. The car dynoed at 213rwkw. Tuned for 95 ron.
I have been to WSID and the car ran a 13.49@ 106.67, with a 60 footer of 2.24.
With some decent tyres or a better driver I am sure the car would run a low 13sec.

[MNR-0]

Gentlemen,

For what they cost to buy and fit, including opening up the cats and replacing the stock 2" intermediate pipe between the catback and cats, I would definately do it again. Cost to me through CSV was $700 all inclusive, and they work well. The catback on my Monaro contributed to the note, not much else. Their header is by far the best quality shorty 4-1 out there. They're stainless unlike HM, and made under contract by a leader in the field, DiFillipo.

If I had my time again, I would buy the headers and think seriously about an after-market pre-fab catback like X-Force. Half the price for similar gains.

I paid for a custom exhaust by CSV of which the tips look very classy. A custom setup is costly compared to the pre-fab stuff and does offer a better fit. The other thing I like about a custom setup it is the after-sales support. No complaints there. However, I rarely look under the car to admire the handywork. I will post pics when I get around to configuring my website.

Still, I aint complaining about a 13.0 QTR mile. Proof enough that they work.

Peak power at the moment is 221rwkw. Was 216 when I ran the 13.0. I have TQ Management issues now where timing is pulled bigtime at peak TQ. I understand LS1Edit doesnt permit modification to Engine TQ Management (I could be mistaken here). Im waiting for my copy of HPTuners to arrive so I can Edit it out.

Weird thing is i get a straight power curve right up to peak TQ, then timings pulled and the curve goes sh!thouse. So theres more in there, just gotta extract it out. I dont plan on going back to the track until the TM Management is sorted.

[markone2]

Ben,

I have a VY series 2 ute M6.

After around 6000km's I went to Sam's and got a mafless edit and 3.91 diff gears. Everything else is stock, except for a K&N air filter. The car dynoed at 213rwkw. Tuned for 95 ron.
I have been to WSID and the car ran a 13.49@ 106.67, with a 60 footer of 2.24.
With some decent tyres or a better driver I am sure the car would run a low 13sec.


Don't worry snowy :) at 213rwkw your car is showing a clean pair of heels to many owners waving worthless sheets of toilet paper around proudly proclaiming 240rwkw :deal: and more…these guys are very easy to find, they always begin there sentences with *Drags don’t interest me*…and then pray to the Gods above no-one but no-one remembers the 101mph they achieved on there 1st and only attempt. at the ¼ mile :D

ps....damn good time for 95ron fuel :thumbsup:

[SS346]

i picked up jak sh.it when i fitted the headers to my car (unopened), imo its not worth the moolah on an unopened ls1,

[Azza]

Keep doing your research mate, I have been looking into it myself for some time now and there are so many out there for the GENIII it's not funny. :bash:
Where are you looking to gain most you must ask yourself?
bottom end/ mid range/ or top end? where do you do most of your driving/revs and what is your driving style. As their are so many that do the job differently and, then how are they made? Has any thought been put into the design or has someone just welded some pipes together and said yep that will do.
Headers do work but, you will only get the best out of them if you get the engine breathing right from induction to the tip of your exhaust, if you do a search for pacemaker they have a page that explains in plain english what they do with working animations and a FAQ page. I am not saying that pacemaker are for you, it's you coin, just don't buy something and think it was a waste of time say if you bought a set of 4 into 1's with 1 7/8" prim pipes. Something like that is not going to really work for you until you start getting into the higher rev range unless you are planning to race your car and or put in a big cam shaft you may not really notice a difference down low/ mid range where it might count, as a set of tri-Y's would or a smaller prim pipe on a set of 4 into 1's.
Again ring around some shops get an idea what they have to say and weight up what their opinon is. Check out some of the exhaust shop sponsors of this forum, heeps of info there too.

[SLE355]

Don't worry snowy :) at 213rwkw your car is showing a clean pair of heels to many owners waving worthless sheets of toilet paper around proudly proclaiming 240rwkw :deal: and more…these guys are very easy to find, they always begin there sentences with *Drags don’t interest me*…and then pray to the Gods above no-one but no-one remembers the 101mph they achieved on there 1st and only attempt. at the ¼ mile :D

ps....damn good time for 95ron fuel :thumbsup:

:lol: Sad but true! ;)

Headers dont seem to be worth alot on an unopened motor but i was happy to run 105mph with tri-y's, stock front cat pipes and diffilipo cat back plus intake modes on a stock tune.

Oh, i think they improve the note though!

[ROK350]

Yeah I will agree there I reckon the note improves substantially with Headers, my 4-1's made a significant difference to the Note. I also reckon there was a noticeable difference to the driveability across the rev range compared to the original manifold. I ran the cat-back only for about 12 months b4 deciding on a set of headers.

[BLACK 346]

QUOTE They're stainless unlike HM, and made under contract by a leader in the field, DiFillipo. UNQUOTE

I have HM's and they are stainless steel.

I agree with those saying not huge amounts to
be picked up power wise over standard manifolds,
but definite improvement in exhaust note. I also
ran just the cat back for about 18 months. Would
I spend the money of extractors again, of course I would. :)

[Dover]

So now i think i want to get a good stainless cat back and a edit. So if i ever decide (i hope i dont. Want so save$$$) on engine work i can get the headers then as it will need another edit anyway? Would that make sence? Should i still get the cats opened up even without getting headders?
Ben

[MNR-0]

QUOTE They're stainless unlike HM, and made under contract by a leader in the field, DiFillipo. UNQUOTE

I have HM's and they are stainless steel.

I agree with those saying not huge amounts to
be picked up power wise over standard manifolds,
but definite improvement in exhaust note. I also
ran just the cat back for about 18 months. Would
I spend the money of extractors again, of course I would. :)

Straight from the HM website

http://www.hmheaders.com.au/New%20Releases.htm

Their VYII 102SS extractors are not stainless, rather ceramic coated mild steel. The extractors you have are probably the Tri-Y or 4-1 long tube. They are stainless, but require new cats and changing the VYII emissions specs.

[BLACK 346]

Straight from the HM website

http://www.hmheaders.com.au/New%20Releases.htm

Their VYII 102SS extractors are not stainless, rather ceramic coated mild steel. The extractors you have are probably the Tri-Y or 4-1 long tube. They are stainless, but require new cats and changing the VYII emissions specs.

My apologies, didn't realise that the VY one were mild
steel :)

Dover...Not sure if having the cats opened up nets
that much of a power gain either. I had mine opened
to 2.5 to match the rest of the exhaust. Its not a big
job, and only cost me $60 to have both sides done.
So not really that expensive as far as mods go.

[Thunder]

What some of you are missing is that Dover has a VY2.

This means his cats are up the front near the steering rack and his cat pipes/con pipes are about a metre long in 50mm tube.

If you decide not to get extractors, it is definitely worthwhile to open up the cats and make the con pipes in 2-1/2".

If you get extractors, get short/mid length ones that keep the O2 sensors forward. Some of these are short enough to re-use the existing cats, wheras the mid length ones keep the )2 sensors forward but you need 2 new cats underneath.

If you fit the normal long Gen 3 extractors, you will lose power and plenty of it. If you get the car tuned, they will tune to the new position which will help.

[chillicatqld]

Hi Thunder

Opening up an old post here, (hope no one minds) and was interested in your opinion on why using the the long extractors in the VYII SS is bad? What would you class as lower figures?

I went with Tri-Y ceramic long headers on mine. Hi-flow cats, custom mandrel 2.5 duel. Stainless mufflers and large resonator, SS Ind Maf pipe,and filter. It ran 213rwkw pre-edit - then went 230rwkw on a conservative tune. :lol:

Do you think I would have probably made better gains than this with the shorter headers? Mark at PT commented that 213 was a "pretty strong pre-edit figure". So I was happy with that... but any comments/experience appreciated.

Must say too - that after about 25000klms clocked on the zorst system - it is now starting to sound so much deeper and meaner, was thinking I may have went too conservative on noise level, maybe even the engine opening up more also! Damn I luv this tune - thanks PT :)

[Grif]

Ive got a VX SS, unopened, untuned, with a 3inch catback and MCAI and i fitted the DiFilippo 4-1 headers with 1.75 primaries and here is the difference between stock and DiFilippo. Click on VX SS before and after headers.
http://www.marranos.com.au/dynoSheets.cfm

Cheers,
Grif