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leebo
Fully Licenced
495 Posts
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 Posted - 05 Dec 2008 : 4:24:32 PM
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hey you know the exhausts everybody has nowadays 2.1/2" cat back systems pretty standard really not only to get a bit more sound out of my car but do these give any noticeable performance in any way or can it depend on the tip you have etc.
if anyone knows I'd like to hear it.
these are all over eBay for like $150-350
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I'll show you the Rick James cell. It's superfreaky!. |
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hsv_babe
Fully Licenced
269 Posts
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Posted - 07 Dec 2008 : 8:56:00 PM
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| i believe they do give you a bit more power because of the air flow. dont qoute me on that tho! but that what i've heard. |
I'd gladly push my holden than drive a bloody ford! |
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VN91SX
Fully Licenced
344 Posts
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Posted - 08 Dec 2008 : 4:09:51 PM
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| Cat back is going to mainly give you a louder sound. To gain performance improvements from the exhaust system, you really need to look at investing in a good set of extractors and a high flow catylictic convertor, and combine that with a cat back system in the size you have suggested (2.5 inch). It really depends on you budget though. |
Edited by - VN91SX on 08 Dec 2008 4:11:24 PM |
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crazybiker
Fully Licenced
141 Posts
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Posted - 08 Dec 2008 : 4:28:28 PM
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Yes. It does make a difference.
I got Pacemaker Extractors, Hi-flow cat, and a 2.5" exhaust all the way through installed 2 weeks ago. Set me back $1200, but it's louder, and goes noticeably better.
Better fuel economy.
A bit more high-end pull.
Alot more low-down torque. Really noticeable.
Alot more responsive. |
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leebo
Fully Licenced
495 Posts
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Posted - 08 Dec 2008 : 4:46:46 PM
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I think i will start off with a 2.1/2" cat back system as that will give me a bit of sound and they are only $269 on EBAY and they are legal by roadworthiness and by P Plate restrictions.
These are some other options i wanted answers to:
3" cat back-does it fit/Does anyone make these for VN?
3" cat back straight pipe-Does anyone make this/It it legal?
Does these exhaust tip have an effect on the sound? |
I'll show you the Rick James cell. It's superfreaky!. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 08 Dec 2008 : 5:14:27 PM
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If you're gonna do an exhaust. You might aswell do it all at once.
You can get the ones off E-bay, but I'm not too sure on it. I got mine custom bent from 2.5" piping.
3"? Yes. It'll fit. If you want, you can have 5". But on a stock or near stock motor, 2.5" is perfect. If you go 3" then you'll lose too much back pressure.
Some do. I've got an X-Force tip on mine.
Oh, and by the way, an exhaust modification is actually illegal (Well it is in NSW, I don't know about where you are). But ANY performance modification is illegal. So that even includes changing to a K&N Filter. |
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leebo
Fully Licenced
495 Posts
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Posted - 08 Dec 2008 : 7:40:43 PM
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I'll take your advice on the fact that i got a stock motor and get the 2.1/2" cat back.
last thing i want is a loss of power to get a big noise from a 3"
I'm in Victoria i don't really no if I'm not allowed to have any mods on my P's but I've heard people talking about it.
I'm on Victoria new red P system and my brother never got into trouble about his 2.1/2" cat back on his VS but i think i will just get it anyway i think I'll be okay as long as i don't have a super loud straight pipe. |
I'll show you the Rick James cell. It's superfreaky!. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 08 Dec 2008 : 9:07:00 PM
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| Just run basically what I've got, you'll notice a difference, and it's still really quiet. Good to keep the coppers away. |
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VN91SX
Fully Licenced
344 Posts
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Posted - 09 Dec 2008 : 5:46:21 PM
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| I agree with Crazy biker with regard to his advice. I got the same system 2 months ago ($1200). 3" is for a car with forced induction, and actually causes a power loss on a motor like the 3800 V6. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 09 Dec 2008 : 5:53:34 PM
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| Yup. 2.5" is good for up to about 150rwkw. So that's some head work and possibly some internals too...or just FI :P |
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nodg
National Driver
1667 Posts
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Posted - 09 Dec 2008 : 6:45:37 PM
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| on a stock motor a 2.5 is a little much down low for the v6 and youll notice a bit less on the takeoff but up mid-higher in the rev range it will be better. Are you still getting engine work done or leaving it stock? if you plan more down the track go 2.5 otherwise go 2.25 inch for best overall results. |
Cheers,
Nodg. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 09 Dec 2008 : 7:20:53 PM
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| Actually...with mine, I've noticed MORE of an increase down low and up to around 3,000 than in the higher revs. |
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nodg
National Driver
1667 Posts
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Posted - 09 Dec 2008 : 7:38:53 PM
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| you must have a v8 supercar by the sounds of things. |
Cheers,
Nodg. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 09 Dec 2008 : 7:58:09 PM
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LOL.
What you mean?
Just a standard S1 VN V6. |
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nodg
National Driver
1667 Posts
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Posted - 09 Dec 2008 : 8:34:08 PM
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| you have larger vlves and other work done to it apparently so its not a stock v6, all the vn/vp v6's ive had had lost a little edge off the mark after a sports exhaust has been put on. |
Cheers,
Nodg. |
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crazybiker
Fully Licenced
141 Posts
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Posted - 09 Dec 2008 : 9:56:46 PM
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Na. It's not.
It's stock standard.
Those heads are like that on every VN. |
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leebo
Fully Licenced
495 Posts
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Posted - 10 Dec 2008 : 11:35:42 AM
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yeah the 2.1/2" cat back will do me fine
thanks guys |
I'll show you the Rick James cell. It's superfreaky!. |
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leebo
Fully Licenced
495 Posts
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Posted - 06 Jan 2009 : 9:29:50 PM
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hey a mate of mine has just got an exhaust for his VX commodore and that's the ecotec V6 same motor really but that aside he has no after market extractors but he just put on a 2.1/2" cat back system that runs from the cat through a resonator and then out the back of the car missing the silencer box and it sounds so great.
It sounds like a V8 you wouldn't know the difference and i would have got the exact same system he's got but of course the VX is much different.
I was thinking of getting a 2.1/2" cat back system cheep through my dads work and taking it down to a local exhaust system. Do u think they will have done many be4 and be able to make it loud like a V8 for me?,i want to do this be4 i weld my tip on for good.
somebody told me they can put (i believe he used the term "hotdog")in it for me to do the job |
I'll show you the Rick James cell. It's superfreaky!. |
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leebo
Fully Licenced
495 Posts
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Posted - 16 Jan 2009 : 5:58:50 PM
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| i got my exhaust on the weekend for $25 brand new of a wrecked vn and im gona chop out the rear muffler and put in a sports resonator that should give it a nice tune. |
I'll show you the Rick James cell. It's superfreaky!. |
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