HSV 4 into 1s

[VY_SS_Commodore]

Are the HSV 4 into 1 Extractors any good? I know they probably are not as good as pacemakers or di fillipos or something, but for someone like me on a bit of a budget, would they help gain power when i go to get a mafless edit. I already have a twin 2 and half inch system on my Vy.

Cheers
Simon

[Uncle Tone]

Cheers
Simon

The VY2 ones are the baby's to go for in the HSV range.......but if midrange torque is your bag then perhaps pacemaker tri Y's.....???? Everyone seems to use these with mafless edits and get great results.

[alexcs]

go striaght for full extractors mate, if only for the sound. the vy2 manifold cant compare to a set of full extractors IMHO.

[GTS454]

My dad has VYS2 Hsv Headers on his CV8 and they seem to work good, but if your planning for stuff like a blower or cam/heads later on id go the di fillipos. :)

[Clubsport R8]

HSV headers are pretty good, being on a budget i would go for them. To be honest you will find more power going an edit, HP tune, Efi live what ever tuning method it maybe, im sure you will be pleasantly suprised ;)

Regards

Tim

[Gareth@Willall]

I just fitted some VY2 HSV Extractors and cats too a VX SS (already had a catback). SOTP there is more mid / top end power and there is a lot nicer growl as you stand on the throttle :) Havent put it back on the dyno but there will be some nice gains to be had for the minimal outlay :D

Gareth

[VY_SS_Commodore]

Excellent, thanks for the replys. I am not planning a cam/stroker for a while yet. I am only 22 years old, so a mafless edit will do me fine, until ,my insurance drops. I think that they will do me fine for what i need.

[Uncle Tone]

go striaght for full extractors mate, if only for the sound. the vy2 manifold cant compare to a set of full extractors IMHO.

The HSV VY2 manifolds are in fact a full set of extractors. :)

[REDHOT SS]

I managed to run 12.55 @ 109mph "unopened" with the earlier HSV VX headers, standard cats and a press bent twin 2.5" exhaust. Out of interest, then changed them for Genie Try-y's and made zero difference on the dyno and felt no different on the road, so for the budget minded i can highly recommend these headers. Hope this helps!

[v8 ute]

I put HSV 4-1 extractors on my Crewman because of all the (dyno & track)testing I had seen.
These are truely the best bang for buck out there, on a stock motor lot's of others will send you backward incomparrison.

[Jphdg]

No probs with unopened edited cars with bolt ons. Mine pulled around 230rwkws with a custom 2.5 inch duel cat back, 2 hole HSV ducted cold air with K&N and mild ported TB. The car responed very well on a MAF edit, so no doubt, would have been even better mafless.

As for track times, I have not taken it down the track yet, but 'pants in the seat' feel was awesome.

While my car was unopened, I compared with a friends car who had a similar tune but ran Difilipo headers through a 2.5 duel system and could not really tell the difference in the feel of the cars, but yes I know, it still is not a real accurate measure, but good enough for me to 'not' justify the extra money.

I am waiting right now for the car to return with cam, mafless tune, valve springs hi stall, OTRCAI etc so, will be able to comment how the car goes with the same exhaust setup soon.

I intend to do a real test down the track to varify how good the entire setup is compared to others who run similar spec mods apart from aftermarket headers.

Then I can comment if the HSV headers respond well on cammed cars.

Not running a massive cam, I am expecting these headers to still do a great job and pull very good figures down the track and on a dyno.

Go for a huge cam or increase the capacity (stroker kets), they may start restricting flow at higher RPM.

I believe they are not bad for what they are and I have no reason yet to change them.

[vt clubsport]

Hi guys
Been trying to find info on VT HSV Extractors,VX HSV Extractors,VY1&2 HSV Extractors,
I currently own a VZ SS and getting a sureflow 3.5" system,Im confused about the differences with the above extractors,Will the VT,VX and VY1 HSV extractors bolt straight on with little mods to o2 sensors and cats.I believe the vy2 bolts staraight on.As the VZ Cats sit very high in engine bay.
Please any help would be great

Cheers

[VYSHSV8]

Hi guys
Been trying to find info on VT HSV Extractors,VX HSV Extractors,VY1&2 HSV Extractors,
I currently own a VZ SS and getting a sureflow 3.5" system,Im confused about the differences with the above extractors,Will the VT,VX and VY1 HSV extractors bolt straight on with little mods to o2 sensors and cats.I believe the vy2 bolts staraight on.As the VZ Cats sit very high in engine bay.
Please any help would be great

Cheers
From my understanding VY2 will bolt up with out any probs but you will have to modify the flange to suite the cats as they are different then you wont have any O2 sensor probs by having to change the poaition of them, vy2 not hsv's have the cats up in the firewall like vz'z but hsv's still use the cats underneath the car if you can try and get the HSV cats aswell and all should be righta as reyne but would still get a edit done for the change position of the O2 sensors.
Hope this helps

Also VY2 are 1 3/4" primarys and I think VY1 and prior models are only 1 5/8th

[vt clubsport]

Thanks vyshsv8
Your info has helpfull,so if i buy vy2 extractors its best to get the extractors back to the cats??
If i buy the vt-vy1 extractors it will cause me headaches.
PS:is the vy2 manifolds still cast (non HSV)

[VYSHSV8]

cant remember if the standard ones are cast or not my car is not here is easy to tell have a look at them and you will be able to tell, my car is out at the moment I am trying to get hold of VY2 extractors for mine as well. Get vy2 extractors, get the flange changed and at the same time have the cats opened up to suit the better flow any reputable exhaust place can do it for you.

[HRT 8]

I got a set of VY2 HSV headers a while back and had them installed last week. They are a straight bolt on proposition only if you get the cats as well, otherwise you'll need to mod the cat flange to suit. If you do that you might as well get them modded and ditch the squashed section after the cat for maximum flow.
Headers fitted and cats modded, cost me far less than a set of Paccies or di fillipo's. Combined with a good 2.5 twin catback and the sound isnt too bad either.
I didnt dyno before and after,but I can confidantly say they made a good improvement, mid and up top.
VY2 HSV headers are 1 3/4 inch while the other pre VY2 are 1 5/8.

I was told by a performance shop that a customer put on a set of Name brand 4-1 headers to replace his HSV headers (the ones I bought) and picked up only 6 rwhp. Not a good bang for buck mod on his behalf.

The VY 2 HSV headers re not that easy to find as they are very good. Most guys with them now realise that changing them isnt worth the dollars.

[vt clubsport]

Hi guys any ideas how much a vy2 hsv extractor back system would set me back???

If i could find one :lol:

[Red CV8 R]

Has anyone done any testing on the HSV short headers vs the CSV and HM short pipes?

[HRT 8]

Has anyone done any testing on the HSV short headers vs the CSV and HM short pipes?
HSV dont make a short header. They still retain the cats in the regular position under the car, not in the engine bay. Im refering to everything up to and including VY2. Im not aware what VZ HSV's use.

[Red CV8 R]

Ah! I never knew this. So why do people refer to using the HSV headers on VY2 etc? Do they move the cats under the car or get new cats on a VY2?

So really there are only two options on a VYs with the cats in the engine bay, HM Shorties or CSV shorties?

[HRT 8]

If your driving a VY2 SS (for example) and use HSV VY2 headers then youll need to buy new cats to place under the car.
Dont know why but HSV didnt follow Holdens use of the bigger Daewoo type cat converter in the engine bay's of VY2's. Id hazard to guess that VZ is also the same and utilises the cats under the car.

[HRT 8]

So really there are only two options on a VYs with the cats in the engine bay, HM Shorties or CSV shorties?
You can use the longer HSV VY2 headers but would need new cats to go under the car and you'd need to have the tune modded to allow for the different O2 sensor position.

[Red CV8 R]

Ahh what threw me on this is people talking about the HSV headers being a cheap straight bolt on option compared to aftermarket headers, so I was thinkning they bolt straight in on VY2. Cats and all. Though now I see this is only on VY1 without work on the cats. Unless as you say you bought the HSV cats to. Yeah it is weird that HSV didnt follow Holden on this.

By the short headeer question I was refering to using the exisitng VY2 cats in their standard location. So that answers my question. Thanks for filling me in on this.

[ecka]

So really there are only two options on a VYs with the cats in the engine bay, HM Shorties or CSV shorties?

...or Genie shorties, who's HPC magnificence shine up at me everytime I pop the bonnet :)

[LSX-438]

hmm thats odd, i was in an exhaust shop today and they gave me a quote for VY2 headers fitted onto my CV8 S3, i was led to believe the stock cats could be used (in the same location) is that not the case?

[LSX-438]

hmm thats odd, i was in an exhaust shop today and they gave me a quote for VY2 headers fitted onto my CV8 S3, i was led to believe the stock cats could be used (in the same location) is that not the case?

i mean VY2 HSV headers (they are HM right?)

[vt clubsport]

So if i bought a set of vy2 hsv extractors to the cats, my sureflo system would bolt straight up????


Sorry guys i should have read my pm mail (already been answered)

Thanks

[HRT 8]

i mean VY2 HSV headers (they are HM right?)
Not possible. The VY2 HSV headers are much longer than the VX HSV headers too. So if they install them on your s3 monaro they will need to have new cats (like the old design) and relocate the o2 sensors.

[JaseR8]

For those who are interested, the VZ HSV's run the larger style cats in the engine bay and are running 2 sets of O2 sensors. I just pulled up a photo I had of my R8 to check it out.

I know that Greg from Sureflo has installed a set of the CSV short 4-1's without a problem on the LS2, but not sure if the VYII HSV headers are a direct install though onto an LS2.

For an LS1, the VYII headers are a definite improvement over stock.

[LSX-438]

Not possible. The VY2 HSV headers are much longer than the VX HSV headers too. So if they install them on your s3 monaro they will need to have new cats (like the old design) and relocate the o2 sensors.
thanks for that, will need t revisit the workshop..

[HRT 8]

thanks for that, will need t revisit the workshop..

Be interesting to see what they say. Keep us informed. Might also be a good indication of the shops knowledge if they are quoting on something they cannot do. :rolleyes:

[HRT 8]

For those who are interested, the VZ HSV's run the larger style cats in the engine bay and are running 2 sets of O2 sensors. I just pulled up a photo I had of my R8 to check it out..

What headers do they use from the factory on these things Jase? You have a piccy.

[LSX-438]

For those who are interested, the VZ HSV's run the larger style cats in the engine bay and are running 2 sets of O2 sensors. I just pulled up a photo I had of my R8 to check it out.

I know that Greg from Sureflo has installed a set of the CSV short 4-1's without a problem on the LS2, but not sure if the VYII HSV headers are a direct install though onto an LS2.

For an LS1, the VYII headers are a definite improvement over stock.

so the VY2 and VZ both run the oval cats in the engine bay? are they different cats to S3 munro (S3 munro is the same as VY2 i believe)

[Sonnymad]

Not possible. The VY2 HSV headers are much longer than the VX HSV headers too. So if they install them on your s3 monaro they will need to have new cats (like the old design) and relocate the o2 sensors.

Thats for sure, i have the VY 2 HSV headers and the cats and i can tell you the cats and the piping are larger then the previous hsv models,and it bolted straight upto my original exhaust,i will be pulling them off soon due to going the turbo setup & the fact i have sold my stroker engine,they did well as i was still making 300kw's with them,though being a stroker it choked the car in mid and top end resulting in 130nm loss of torque right thru the range,but on a std car or head cam,they will be perfect.

regards sonny

[JaseR8]

What headers do they use from the factory on these things Jase? You have a piccy.

Hi Grant, I don't have a good pic but from the factory the Z HSV's run stock cast iron manifolds, no headers at this stage. These manifolds run into oval shaped cats which are 2inch at the manifold connection and 3inch on exit. There is then a twin 3inch intermediate pipe section to the first set of mufflers, then is runs twin 2.5inch to the rear resonator.

On my R8 I have left the manifold, cats and the 3" sections, replaced the mufflers with "Hotdogs" then I run a new twin section back to a slightly larger rear resonator (to stop the cabin drone). I am looking around for short 4-1 headers at the moment so that when I get back to Oz I can get them put on.

My guess is that as soon as Holden get the LS2 for the SS then the HSV's will run short style 4-1 headers to give the performance edge.

[LSX-438]

Not possible. The VY2 HSV headers are much longer than the VX HSV headers too. So if they install them on your s3 monaro they will need to have new cats (like the old design) and relocate the o2 sensors.

i'm still confused, are the HSV VY2 headers short 4->1's? Today i visited Tuffy mufflers at Rosebery, they have a similar setup to the HM HSV 4>1 without the squashed pipe bits (although they are happy to supply the HM ones if I prefer) but they tell me these are both shorty headers that enable me to keep the VY2 oval cats in the engine bay and stock O2 locations. Perhaps we're thinking about different headers?

Are these the same as the VY2 HSV items?
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=4561134501

[Sonnymad]

i'm still confused, are the HSV VY2 headers short 4->1's? Today i visited Tuffy mufflers at Rosebery, they have a similar setup to the HM HSV 4>1 without the squashed pipe bits (although they are happy to supply the HM ones if I prefer) but they tell me these are both shorty headers that enable me to keep the VY2 oval cats in the engine bay and stock O2 locations. Perhaps we're thinking about different headers?

Are these the same as the VY2 HSV items?
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=4561134501

They are no where near or even look like the hsv ones....

[LSX-438]

They are no where near or even look like the hsv ones....

ok thanks Sonny. Unfortunately a couple of shops have told me these really short ones are the same (as HSV). Sorry about the confusion.

[Pv8]

ok thanks Sonny. Unfortunately a couple of shops have told me these really short ones are the same (as HSV). Sorry about the confusion.

Like Sonny said those are far from the VY2 HSV's.
The HSV's look like a job done by a Race Exhaust Development centre, there very very good for OEM gear.

How much do you want for them Sonny? Can you PM me mate.

[AussieTone]

I've got the HSV VY2 R8 extractors. Had the square flange cut off and the extractors welded onto my opened up standard cats (VY1 SS). Add to this a redback cat back system, 2 hole mod, gts maf pipe and a maffless tune from the magician (Mark at Powertorque) and instant 231 rwkw.

The HSV extractors cost me $300 supplied and fitted from an exhaust shop. Mind you that was 12 months ago. All I did was do the ring around all the exhaust shops to see if anyone had a set.

[VYSSBlack]

Would older HSV systems such as a HSVVX still be of benifit over a Holden VYII system?