trumpy955 Member 183 Member For: 17y 10m 21d Gender: Male Location: Gladstone Queensland Posted 30/05/09 02:23 AM Posted 30/05/09 02:23 AM Hey all. I have been talking to numerous Exh shops and told numerous things. I was looking at changing my standard system so I could get a better note. I wanna know if its better to go a single 3 1/2 inch system or a dual 2 1/2 inch system. what are the pros and cons of each. I was also told by two shps that a single 3inch system works better on these than a single 3 1/2. can anyone help me on this as its getting very confusing. I already have intake side and injectors done. so next is to sweeten that note. pumping out 291 RWKW so far.
Bender Member 178 Member For: 18y 9m 17d Location: Newcastle Posted 30/05/09 02:40 AM Posted 30/05/09 02:40 AM (edited) LOL what ever shops said 3inch is better then 3.5inch I wouldn't be going there.a standard exhaust is better then a 3inch system.. By that I mean you'll get more power out of a standard exhaust then a 3inch system (with a gutted centre muffler and a hi flow cat).A dual 2 1/2 system will flow more then a 3.5inch system. But for 300rwkw 3.5inch will be heaps!get yourself an x-force system or something along those lines and you'll be happy. Edited 30/05/09 02:40 AM by Bender
R-SPEC You are a dead set goose Legacy Donating Member 3,968 Member For: 20y 9m 24d Gender: Male Location: Melbourne Posted 30/05/09 04:05 AM Posted 30/05/09 04:05 AM All the 3.5" Xforce ones I've heard make a whistling noise at WOT as gas is separated out to the dual tips. I think it's personal preference, as I've never seen more power from either a 3.5" or a twin 2.5" when compared on the same car...
John_K Legacy Donating Member 438 Member For: 17y 9m 18d Gender: Male Location: Sydney Posted 30/05/09 04:24 AM Posted 30/05/09 04:24 AM If it's just to "get a better note" just have the centre muffler replaced with straight pipes.You're wallet and your ears both win!
typhoon_freak Cryptic Clothing Company Legacy Donating Member 4,556 Member For: 18y 2m 13d Gender: Male Location: Brisvages, Capalaba Posted 30/05/09 05:00 AM Posted 30/05/09 05:00 AM I love the note of my exhuast, iv got a 3.5inch split dump, to twin 2.5inch to quad exit. but I hit 390rwkw and is a restriction for me now. so look at what your future plans are for the car and go from there. my exhuast sounds way diferent after my new tune.
trumpy955 Member 183 Member For: 17y 10m 21d Gender: Male Location: Gladstone Queensland Posted 31/05/09 05:07 AM Author Posted 31/05/09 05:07 AM To be honest. I am not a fan of the centre muffler removed sound. I heard a single 31/2 " system recently and I liked it. havent heard a dual 2 1/2 " system yet. so I may wait till I hear one of them. I dont really want much more power, its just off 300 at the wheels so it has no problem getting moving. altho some problem putting power down in the wet *Grinning like a cheshire cat* but I am not sure if I should do the whole system anyway. dump pipe and cat with pipes or just cat back. Power now is no longer the issue. but who knows, the bug has bitten, more power is always a consideration.
trumpy955 Member 183 Member For: 17y 10m 21d Gender: Male Location: Gladstone Queensland Posted 31/05/09 05:09 AM Author Posted 31/05/09 05:09 AM All the 3.5" Xforce ones I've heard make a whistling noise at WOT as gas is separated out to the dual tips. I think it's personal preference, as I've never seen more power from either a 3.5" or a twin 2.5" when compared on the same car...I have seen two with a single outlet off a 3 1/2 " system and altho a little different, it didnt look any wher near as bad as I thought I would have.
qik1 Legacy Donating Member 2,720 Member For: 18y 4m 12d Gender: Male Location: Loitering in SEQ Posted 31/05/09 07:28 AM Posted 31/05/09 07:28 AM (edited) The 3 1/2 system sounds crap in my opinion. The sound that comes out at full noise is like when you put your ear out the window of your car at 100klm/hr. The cat also crapped its self after 3000klm or there abouts. With quite a few back to back exhaust tests the rear muffler when the car had about 500hp was holding back 25hp. Its only my experience but just saying it didnt work for me. I tried running with no rear muffler for a while & sounds great at full noise but when idling sounded like a mac truck. I've recently put a muffler on supplied by chris at rapid systems with twin 3 1/2 tips & it now sounds great at any revs. Try sending him a pm. It'll flow to what you need & goin by what he supplied me it should sound mad. Edited 31/05/09 07:34 AM by qik1
t6xr Member 826 Member For: 18y 10m 30d Gender: Male Location: MELB STH EAST Posted 31/05/09 06:05 PM Posted 31/05/09 06:05 PM Ive got a X-FORCE 3 1/2 system on mine and wasnt happy with the performance and note the muffler was producing. When hitting boost levels it had a whistling noise as R SPEC mentioned earlier. Now I have changed it to a magnaflow race series muffler with a 4" dump pipe and it has made a huge difference with flow and sound.
Mr Man Mad Scientist Member 816 Member For: 21y 9m 25d Gender: Male Location: Vic Posted 01/06/09 06:34 AM Posted 01/06/09 06:34 AM (edited) I have the XForce 4" dump and 3.5" single system, mine doesnt make the whistle noise and I have the twin tips, although mine is a ute so I dont have the single in twin out rear muffler, just straight pipe until the Y piece for the tips... Edited 01/06/09 06:36 AM by Mr Man
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