stock VY SS - Stock VY HSV exhaust - whats the difference

[kpop]

ok, like the title sais, what is the difference between a stock vy ss catback exhaust, and a stock vy hsv catback exhaust

so far all i can tell is that the hsv is entirely stainless steel ?

[iloveholden]

I thought both were ss. I'd be guessing but aren't the catbacks pretty much the same...its the headers that are different from HSV to an SS exhaust system? :confused:

[Wonky]

I thought both were ss. I'd be guessing but aren't the catbacks pretty much the same...its the headers that are different from HSV to an SS exhaust system? :confused:

That's what I thought too! I had a VY SV8 and 2 VZ SSs and I'm sure all three had full stainless systems........

[wyldnyt]

I thought both were ss. I'd be guessing but aren't the catbacks pretty much the same...its the headers that are different from HSV to an SS exhaust system? :confused:

And the cats are different also

[HSVREDSLED]

And the headers from HSV VY series 1 to HSV VY series 2 changed.

[troytroy]

The VYII SS had cats closer to manifold (better for emissions) whilst the YII HSV still had the cats under the car. Both are Stainless Steel.

As stated above the Headers/manifold are the main difference between the two.

I'm betting the catback difference would be negligable. My HSV catback had two or so factory squish points. It was 2 1/4 diameter. Without cutting the cats, mufflers and resonator in half it would be hard to say the difference. My guess is that the HSV mufflers might be a little less restrictive, as well as the cats. But again - little difference.

You'll also find that the HSV exhaust tips will extend past the rear bumper of an SS a little morem due to the HSV rear bumper being a little longer.

[kpop]

thanks for all the info fellas :)

its just theres a very nice (almost brand new) hsv catback going on ebay, and was wondering if its worth getting over just a standard ss catback

guess ill just save some coin and get the ss catback! (as long as it has chrome tips too)

[NewV8]

I thought the VYII HSV was an half inch bigger.

[nick_]

I thought the VYII HSV was an half inch bigger.

Apparently so, but all of the exhausts have press marks in them so I don't think it would matter that much..

-Nick.

[troytroy]

Apparently so, but all of the exhausts have press marks in them so I don't think it would matter that much..

-Nick.

The HSV YII catback was no different to previous - the cool bit was that the entry into the cats (flange) was 2.5 inches and the pipe between the headers and the cats was 2.5" rather than 2 1/4". The collector part is also 2.5" vice 2 1/4" I think the headers primaries are 1 5/8. For a factory stainless steel headers system they were of an aftermarket standard -especially for late 2003. Sure Pacemakers and Di Fillipos are better...but the miniscule extra power wouldn't justify the near on double extra dollers.

[Bens vysv8]

HI guys i have an vy sv8 2 i have the ss cat back system and i was wonder my m8 has a vt hsv extractors he said i can have would u bother with it or would it be to much hassel moving the cat to suite

[DukeZ]

vt hsv headers are just cast manifolds so u wont be acheiving anything by replacing ur cast manifolds with his

[nick_]

I remember seeing some shorty extractors on eBay to suit the VY2 setup.
Just found them with a quick google search. Best to ring them to find out if they fit up 100%

http://www.dkne.com.au/holden-commodore-vyseriivz-mendral-bend-prim-p-263.html
http://www.dkne.com.au/holden-commodore-vyseriivz-mandral-bend-prim-p-290.html

-Nick.

[SS Enforcer]

The HSV YII catback was no different to previous - the cool bit was that the entry into the cats (flange) was 2.5 inches and the pipe between the headers and the cats was 2.5" rather than 2 1/4". The collector part is also 2.5" vice 2 1/4" I think the headers primaries are 1 5/8. For a factory stainless steel headers system they were of an aftermarket standard -especially for late 2003. Sure Pacemakers and Di Fillipos are better...but the miniscule extra power wouldn't justify the near on double extra dollers.

The HSV YII are actually 1 3/4" headers and you can get em flowing better if you weld em on the outside and grind out the original welding inside the pipes as we did with mine.

cheers

[ti0350]

I remember seeing some shorty extractors on eBay to suit the VY2 setup.
Just found them with a quick google search. Best to ring them to find out if they fit up 100%

http://www.dkne.com.au/holden-commodore-vyseriivz-mendral-bend-prim-p-263.html
http://www.dkne.com.au/holden-commodore-vyseriivz-mandral-bend-prim-p-290.html

-Nick.

Not a bad price those,

[DukeZ]

i got vy hsv headers for 50 buck from a member on here was a wikid deal and fitted them with another member on here so if u look around u will find em

[OVZ-346]

those headers linked to a few posts prior look near identical to VCM headers

if they are the same as the VCM ones id like to know what size the vcm ones actually are i bought a set and fitted them last week to my vzss ute they fit very well but i changed the flanges on the collector

[ti0350]

If i could find a cheap set of HSV headers to fit my VYSS I'd jump at them have a mate with an exhaust shop who fit them for nothing for me..

[DukeZ]

mate they are bout 2 hours to fit IF that really easy job

[andrewslr]

If i could find a cheap set of HSV headers to fit my VYSS I'd jump at them have a mate with an exhaust shop who fit them for nothing for me..


A bit of patience required as I found a set of VYII HSV headers and cats eventually here on the forum. Fitted along with a VY SS ute catback to my VZ wagon and am extremely impressed by the result.

Sure an aftermarket catback would be better, but also noiser in the wagon. But bang-for-buck this has proven to be a great combination.

No dyno results to support, but 'seat of pants' experience shows the car to be a lot stronger under WOT and a very nice note too. At idle sounds pretty much stock, no drone, no unwanted attention.

Find a set of these and you wont be dissappointed. Use the search function as I am sure there was a set for sale in Melbourne for $300 or so.

[surfwagon]

vt hsv headers are just cast manifolds so u wont be acheiving anything by replacing ur cast manifolds with his

The only HSV to have cast haeders (same as Holden) was the VZ LS2 to keep the kw artificially low (297) to allow HSV a little extra when the heavier VE came along with extractors fitted (307 same LS2).
All VT HSV's. both Holden 308/355 and Chev LS1 had extractors fitted.
The VT2-VY1 LS1 extractors are 41mm primaries and fit all VT2-VY1 commodores.
With regards to catbacks the biggest difference is in the rear mufflers, the SS one is a reverse flow and the HSV is sort of straight through (the pipes twist with in the muffler but you can still push a garden hose through it).

[DukeZ]

so if thats the case why does my mates vx clubsport (non r8) have cast manifolds?????

[clubbie]

Cant answer why your mates VX clubbie has cast manifolds but every clubsport and R8 (and GTS) from VTII to VYII had extractors fitted from HSV.

The exhaust/tune/intake was the only diiference from any other LS1.

[surfwagon]

so if thats the case why does my mates vx clubsport (non r8) have cast manifolds?????

Maybe its a fake or the previous owner fitted them, maybe a new engine, who knows but it should have HSV extractors fitted.

[dyno junkie]

ok, like the title sais, what is the difference between a stock vy ss catback exhaust, and a stock vy hsv catback exhaust

so far all i can tell is that the hsv is entirely stainless steel ?

HSV catback has larger diameter pipe work and straight through mufflers unlike the Holden catback which is smaller diameter pipe work and triple flow mufflers.

[wadevzss]

Anyone know which HSV Headers will fit up to the VZ SS so the cats stay in the standard spots.

[planetdavo]

Anyone know which HSV Headers will fit up to the VZ SS so the cats stay in the standard spots.

None of them. Only the VZ LS2 cast manifolds would, as they are the same as VT-VZ LS1.
You will need something like HM Headers shorties.

[surfwagon]

None of them. Only the VZ LS2 cast manifolds would, as they are the same as VT-VZ LS1.
You will need something like HM Headers shorties.

Don't HSV VY11's have the shorty extractors and with the trapazoidal cats being similar and in the same position as the VZ.
I'm pretty sure some guys on here have fitted HSV VY11 shorty extractors to VZ V8's.
The guys from HM said the HSV VY11 shorty's were similar but not exactly the same as the 2 1/4" shorty's HM sell on ebay but both have the same outlet size and position.
I believe the main differences between the HSV VY 285 and the VZ 297 cats are that the VY11 has 2 1/4" outlet with the shorty extractors in front and the VZ has stock manifolds and is 3" outlet after the cats .

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[SSN8TER]

i have heard that the hedders on a vy hsv are a great bit of kit and dont need to be replaced.

[surfwagon]

Anyone know which HSV Headers will fit up to the VZ SS so the cats stay in the standard spots.

Pretty sure the HSV VY11 285 headers fit the VZ V8 commodores.
They are similar if not the same as these:
http://cgi.ebay.com.au/HM-Headers-Holden-HSV-MONARO-VY-II-VZ-II-5-7L-6-0L-/140410506705?cmd=ViewItem&pt=AU_Car_Parts_Accessories&hash=item20b11e4dd1

[Wonky]

i have heard that the hedders on a vy hsv are a great bit of kit and dont need to be replaced.

NOT VY HSV!! VY2 HSV are the ones to get!! I know someone who had VY HSV headers on his SV8 then went to VY2 and gained quite a bit of power SOTP and on the dyno!

[VL Executive]

Are these the VY II HSV Extractors?

http://i.ebayimg.com/17/!BzerdyQBWk~$(KGrHqYOKjgE)OofPoj3BMWM8Qfw3w~~_12.J PG

[v8dude78]

No they are VTII, VXI & II + VYI
Have a look here http://www.ls1.com.au/forum/showthread.php?t=93292&highlight=hsv+extractors&page=2

[VL Executive]

No they are VTII, VXI & II + VYI
Have a look here http://www.ls1.com.au/forum/showthread.php?t=93292&highlight=hsv+extractors&page=2

Thanks v8dude78,

Just another question. If I fitted VY II HSV extractors to my VY II SS ute, I guess I would need wiring extentions for the Oxygen sensors?
And I spose the cats are different.

[v8dude78]

Not really sure i know on the VZ the cats are up near the engine and are different.
Have a look at your's if the cats are underneath the drivers seat area then no but if they are like the VZ then yes you will need the extensions and same goes for the cats

[macca_779]

so if thats the case why does my mates vx clubsport (non r8) have cast manifolds?????

The previous owner probably swapped them with a mate who owns a Holden. Either way they aint standard

[russellvx]

sorry to hijack. but anyone selling HSV vx-vy stock cat back? in SA?

[surfwagon]

HSV VY11 have the cats up high like the HSV Z, in fact you can bolt in VY11 extractors into the Z's as the Z's come with stock manifolds.
So which extrators you choose depends on the location of your std factory cats.
As said before if your cats are ubder the car/ drivers seat then you need to use VT11-VY HSV extractors and pre cat pipes.
If your cats are up close to the engine angling upwards then you use the VY11 extractors.
I could have fitted VY11 extractors to my Z (bolt straight in) but went with Sureflow shorties as they have a 3" outlet (stock 2 1/4") and I used 3" in/out cats to replace the stock cats.



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[v8dude78]

HSV VY11 have the cats up high like the HSV Z, in fact you can bolt in VY11 extractors into the Z's as the Z's come with stock manifolds.
So which extrators you choose depends on the location of your std factory cats.
As said before if your cats are ubder the car/ drivers seat then you need to use VT11-VY HSV extractors and pre cat pipes.
If your cats are up close to the engine angling upwards then you use the VY11 extractors.
I could have fitted VY11 extractors to my Z (bolt straight in) but went with Sureflow shorties as they have a 3" outlet (stock 2 1/4") and I used 3" in/out cats to replace the stock cats.



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You might want to have a look at this thread as well http://www.ls1.com.au/forum/showthread.php?t=93292&highlight=hsv+extractors&page=2
Both the VTII, VXI & II + VYI hsv extractors with cat pipes and the VYII 1.75 LONG hsv extractors have the cats sitting under the drivers seats

[CALDIR]

so if thats the case why does my mates vx clubsport (non r8) have cast manifolds?????

Hi

Is the Clubsport white?

regards,

Richard
HRTSEN

[surfwagon]

You might want to have a look at this thread as well http://www.ls1.com.au/forum/showthread.php?t=93292&highlight=hsv+extractors&page=2
Both the VTII, VXI & II + VYI hsv extractors with cat pipes and the VYII 1.75 LONG hsv extractors have the cats sitting under the drivers seats

Sorry my mistake I knew the VY11 were one piece to the cats but forgot they they are still just as long.
I have been seeing those adds for the HM shorties (Holden VY2 and VZ)[http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=140432458751&_trkparms=tab%3DWatching] for so long I'd forgotten what the HSV VY11 headers actually look like.
But basically what I said before sort of still applies in that if the cats are under the car/drivers seat you can use the HSV extractors (all VT11-VY11) and if your cats are up high you'll need those HM shorties.

[VL Executive]

HSV VY11 have the cats up high like the HSV Z, in fact you can bolt in VY11 extractors into the Z's as the Z's come with stock manifolds.

If your cats are up close to the engine angling upwards then you use the VY11 extractors.

But how can that be, when the VY II extractors have the longer pipe?

These are the VYII Extractors -

http://i2.photobucket.com/albums/y47/dwaynE2100/Various%20Pictures/27042007114.jpg

Edit - beat me to it v8dude78

Anyway Ill turn it into another question - I assume the cats bolt directly on to the extractors, then the cat back part of the exhaust system bolts directly to the cats?

There are no intermediate pipes?

Sorry for the ameture type questions, but Im thinking about fitting them to my VY II SS ute.

[surfwagon]

VL executive
As you noticed I have ammended my original statement after I realised I was thinking that the HM shorties and HSV VY11's were the same which they are not.
HSV VT2-VY1 are 41mm headers which then have a separate secondary pipe to the cats where as the HSV VY2 are 44mm headers with the secondary pipe part of the headers.
Not sure though if HSV's use bigger cats than std LS1's but the catbacks VT2-VY1 HSV and twin cat Holden are interchangable bolt on wise.
As for fitting your VY11 ute it still depends on where your cats are because if they are up high as I'm led to believe, then you would need to buy the HM shorties for a true bolt in as neither of the hSV models will fit.


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[v8dude78]

But how can that be, when the VY II extractors have the longer pipe?

These are the VYII Extractors -

http://i2.photobucket.com/albums/y47/dwaynE2100/Various%20Pictures/27042007114.jpg

Edit - beat me to it v8dude78

Anyway Ill turn it into another question - I assume the cats bolt directly on to the extractors, then the cat back part of the exhaust system bolts directly to the cats?

There are no intermediate pipes?

Sorry for the ameture type questions, but Im thinking about fitting them to my VY II SS ute.

Yep thats right :goodjob:


VL executive
As you noticed I have ammended my original statement after I realised I was thinking that the HM shorties and HSV VY11's were the same which they are not.
HSV VT2-VY1 are 41mm headers which then have a separate secondary pipe to the cats where as the HSV VY2 are 44mm headers with the secondary pipe part of the headers.
Not sure though if HSV's use bigger cats than std LS1's but the catbacks VT2-VY1 HSV and twin cat Holden are interchangable bolt on wise.
As for fitting your VY11 ute it still depends on where your cats are because if they are up high as I'm led to believe, then you would need to buy the HM shorties for a true bolt in as neither of the hSV models will fit.


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You can fit either the VT II to VY I extractors or the VY II extractors to any model commodore from VT II to VZ if fitting to a VZ then you will need the O2 extension leads to reach the O2 sensor's and of course cats to suit.

Same applies if fitting Pacies, De filippo, H&M etc to a VZ

Pretty sure standard 5.7 VY II cat location is same as the 5.7 VZ so as above applies to VY II too

[VL Executive]

You can fit either the VT II to VY I extractors or the VY II extractors to any model commodore from VT II to VZ if fitting to a VZ then you will need the O2 extension leads to reach the O2 sensor's and of course cats to suit.

Same applies if fitting Pacies, De filippo, H&M etc to a VZ

Pretty sure standard 5.7 VY II cat location is same as the 5.7 VZ so as above applies to VY II too

Cat position is the same on VY II as the VZ.

So basically, all I would need is the extractors, the original HSV cats or cats to suit the extractors, and the O2 extension wiring. And the system from cats back would bolt straight up to it.

Sounds easy enough to me. :D

[surfwagon]

Cat position is the same on VY II as the VZ.

So basically, all I would need is the extractors, the original HSV cats or cats to suit the extractors, and the O2 extension wiring. And the system from cats back would bolt straight up to it.

Sounds easy enough to me. :D

Or you could buy a HSV VZ exhaust and just fit shorty extractors.
The HSV Z exhaust has 3" pipes netween the cats and the centre mufflers like this one on ebay at the moment.
http://cgi.ebay.com.au/holden-hsv-r8-exhaust-system-/330458100838?cmd=ViewItem&pt=AU_Car_Parts_Accessories&hash=item4cf0d67466
HSV VZ exhaust pic
http://i130.photobucket.com/albums/p266/surfwagon/2009-04-02-0551-35_edited.jpg

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[VL Executive]

I managed to get hold of a pair of VY II HSV extractors. But I did not have the cats to suit them. So Im deciding which way I should go with the cats.

Go with stock HSV cats or the 100cpi ballistic cats.

Can you get the ballistic cats from Sureflow, ready to bolt straight up to the HSV extractors and to the exhaust system.

[mickeyVX350]

I managed to get hold of a pair of VY II HSV extractors. But I did not have the cats to suit them. So Im deciding which way I should go with the cats.

Go with stock HSV cats or the 100cpi ballistic cats.

Can you get the ballistic cats from Sureflow, ready to bolt straight up to the HSV extractors and to the exhaust system.

My exhaust guys did a bit of dropsaw action and openned the stok cat inlet. Seems to work!

[surfwagon]

Sureflow cats like most aftermarket cats just have pipe ends and need to be welded in or have flanges welded onto them.



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my senator http://www.ls1.com.au/forum/showthread.php?t=121025&highlight=senator

[VL Executive]

Sureflow cats like most aftermarket cats just have pipe ends and need to be welded in or have flanges welded onto them.

I thought so, I did not think they did them ready to fit / bolt on. :confused:

[Wonky]

Can you get the ballistic cats from Sureflow, ready to bolt straight up to the HSV extractors and to the exhaust system.

They need to have flanges welded onto them. The welding guy who does plenty of Ballistics at Chev's charges (from memory) $120 for welding and fitting (with Chev).