extractors

[Archers]

ay fellas I'm looking at getting some extractors, has anyone here got a vz 175 with extractors and no exhaust? i want to keep it standard I'm gonna do the 2 hole mod and extractors thats it. so my questions

1 is it worth getting the cats with the extractors?

2 power figures with the cats and without?

3 fuel economy how much better?


thanxs for the input

[Not_An_Abba_Fan]

I only know from experience about the 195. A mate has the SV6 and I put a twin 2 1/4" - 3" single on it and he put a K&N filter in. It pulled 193rwhp. After that I put extractors and hi flow cats on it. He hasn't had it dyno'd yet but he says it is way more responsive and pulls a lot harder in the mid level rev range. He is getting a mafless tune soon and getting it tweaked, the tuner claims a 20-30 rwhp increase, we will see. Oh, and he also got better fuel economy after the extractors and cats.

My advice is to change the exhaust as well, the alloytec likes to breathe, and just doing extractors and cats will not really change much. You may feel a bit more torque, but you will run out of legs as the exhaust restricts the engine as the revs climb.

[Archers]

I only know from experience about the 195. A mate has the SV6 and I put a twin 2 1/4" - 3" single on it and he put a K&N filter in. It pulled 193rwhp. After that I put extractors and hi flow cats on it. He hasn't had it dyno'd yet but he says it is way more responsive and pulls a lot harder in the mid level rev range. He is getting a mafless tune soon and getting it tweaked, the tuner claims a 20-30 rwhp increase, we will see. Oh, and he also got better fuel economy after the extractors and cats.

My advice is to change the exhaust as well, the alloytec likes to breathe, and just doing extractors and cats will not really change much. You may feel a bit more torque, but you will run out of legs as the exhaust restricts the engine as the revs climb.

ok m8 thats cool i want the car to be quiet so if i put an exhaust on it can they make it sound quiet as it is now? i can get that thru u like the extractors? so a full package u rekon?

[Not_An_Abba_Fan]

The system I put on my mates car isn't loud. It doesn't drone but it does have a sort of note to it...hard to explain. I'll see if I remember to take a sound clip of it tonite when I see him.

[andyman]

just bolt up v8 zorst, its quiet, looks good at the rear, and freeer flowing

[Insane_Metal_Man_666]

I only know from experience about the 195. A mate has the SV6 and I put a twin 2 1/4" - 3" single on it and he put a K&N filter in. It pulled 193rwhp. After that I put extractors and hi flow cats on it. He hasn't had it dyno'd yet but he says it is way more responsive and pulls a lot harder in the mid level rev range. He is getting a mafless tune soon and getting it tweaked, the tuner claims a 20-30 rwhp increase, we will see. Oh, and he also got better fuel economy after the extractors and cats.

My advice is to change the exhaust as well, the alloytec likes to breathe, and just doing extractors and cats will not really change much. You may feel a bit more torque, but you will run out of legs as the exhaust restricts the engine as the revs climb.

yeah my housemate got a VY, i guess it aint a VZ but yeah he has done exhaust and extractors and other various mods to his current ride, but far out it has got so much pick up and go for a 6 in a commo, cant wait till i get a VZ fingers crossed next month and do some additional mods on my ride also.

[Archers]

ok i got a fitting price for extractors today it will be 230? is that good? doesnt sound that good? so a gen3 exhaust will fit stright up to my car? not cutting no welding? vt-vz? all will fit? and i dont really want to do my cats can i get away without them being changed?

this is the exust i was looking at any help appriciated


http://cgi.ebay.com.au/ws/eBayISAPI....m=280302580481

[f1tzy]

That will probably be loud. Andyman was referring to a standard vy/vz v8 exhaust

[Skooby]

They are supposed to drone bad on a 6 Commodore.

I have some exhaust cutouts for sale, how about leaving the rear part standard and fitting the cutouts to make it loud like a Supercar at the flick of a switch? hahah

[monaro327]

I only know from experience about the 195. A mate has the SV6 and I put a twin 2 1/4" - 3" single on it and he put a K&N filter in. It pulled 193rwhp. After that I put extractors and hi flow cats on it. He hasn't had it dyno'd yet but he says it is way more responsive and pulls a lot harder in the mid level rev range. He is getting a mafless tune soon and getting it tweaked, the tuner claims a 20-30 rwhp increase, we will see. Oh, and he also got better fuel economy after the extractors and cats.

My advice is to change the exhaust as well, the alloytec likes to breathe, and just doing extractors and cats will not really change much. You may feel a bit more torque, but you will run out of legs as the exhaust restricts the engine as the revs climb.

really keen to hear the results of his"mafless" tune lol.

[RVN 355]

Just do a cat back single, full stainless and Magnaflow muffler,the stock vz headers are good enough for more power.

[kinga]

Just do a cat back single, full stainless and Magnaflow muffler,the stock vz headers are good enough for more power.

I agree, I went through this with my last commodore, talked to a few exhaust shops and they said to work backwards from the rear end of the system with your upgrades. Putting extractors in with out catback is a bit of a waste of time as the standard cat and exhaust restrict the flow from the extractors.
I would get sports exhaust, cat back system, then extractors in that order

[Archers]

I agree, I went through this with my last commodore, talked to a few exhaust shops and they said to work backwards from the rear end of the system with your upgrades. Putting extractors in with out catback is a bit of a waste of time as the standard cat and exhaust restrict the flow from the extractors.
I would get sports exhaust, cat back system, then extractors in that order

yeah im thinking twin exhaust maybe form a v8 second hand maybe and then extractors dont want to do the cats.

[Archers]

i just rang a few places about a cat bk and they said twin will lose torque and power? so i should go single 2/5? correct?

[f1tzy]

PM Not an abba fan he seems to know what works well on the alloytec

[RVN 355]

its a commodore,the exhausts are simple. Single 2.5" -3" with other mods of course for the later.

Wouldn't worry about going a twin system unless you are going to keep the car and do work to the engine to warrant the need for its effectivness and with the right choice in muffler should sound good.

[baracuda]

so for the VZ SV6 just a single 2.5-3" system and work from the back to open her up??
lets just keep it simple

[Archers]

i just got a quite for 910 for a set of extractors and cat back fitted with tip sound good what u guys think?

i got qouted from carline at kilkenny has anyone delt with them? are they good? thanxs scott

[Not_An_Abba_Fan]

People seem to forget that the alloytec is not your run of the mill Commodore engine. It benefits from being opened up. Twin 2 1/2" is too big, single 2 1/2" is too small. A company over here has done extensive dyno testing of different systems on them and has found that the twin 2 1/4" into a single 3" works the best. That coupled with a decent set of extractors and hi flow cats will net around 200-210 rwhp without a tune.

rvx 219, what brand are the headers and what size is the system?

[Archers]

People seem to forget that the alloytec is not your run of the mill Commodore engine. It benefits from being opened up. Twin 2 1/2" is too big, single 2 1/2" is too small. A company over here has done extensive dyno testing of different systems on them and has found that the twin 2 1/4" into a single 3" works the best. That coupled with a decent set of extractors and hi flow cats will net around 200-210 rwhp without a tune.

rvx 219, what brand are the headers and what size is the system?

im not sure of the brand of extractors and just a 2 1/2 exhuast cat back should i go 3 inch? i want it quite, im gonna leave the standard cats on!

does it really matter about brands?