# Exhaust size **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [August 27, 2007, 1:20pm UTC](https://forums.speedlife.net/t/exhaust-size/192058 "2007-08-27T13:20:29Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![watacanga](https://avatars.discourse-cdn.com/v4/letter/w/85f322/32.png) [@watacanga](https://forums.speedlife.net/u/watacanga)\ **Post date:** [August 27, 2007, 1:20pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/1 "2007-08-27T13:20:29Z")
Will a 2.5" N1 be too small if i’m going to have a gt35r turbo? do i need to find a 3"? It will be hooked up to a b18b ---
**Author:** ![yamaha](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/yamaha/32/5929_2.png) [@yamaha](https://forums.speedlife.net/u/yamaha)\ **Post date:** [August 27, 2007, 2:17pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/2 "2007-08-27T14:17:53Z")
I would go with a 3" exhaust, which is good up to some crazy amount of power. Remember, the more air you can get in and out of the engine, the better. ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [August 27, 2007, 3:22pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/3 "2007-08-27T15:22:33Z")
if it is a bottom mount go with a 3" if it is a top mount get a custom made 4" ---
**Author:** ![munster\_ek](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/munster_ek/32/5977_2.png) [@munster\_ek](https://forums.speedlife.net/u/munster_ek)\ **Post date:** [August 27, 2007, 6:13pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/4 "2007-08-27T18:13:39Z")
> [@\*\*Official Grand Prix Toronto '07 thread\*\* OMG now with sexy newman pictures!!!!](https://forums.speedlife.net/t/official-grand-prix-toronto-07-thread-omg-now-with-sexy-newman-pictures/31939/156): > > if it is a bottom mount go with a 3" if it is a top mount get a custom made 4" ---
**Author:** ![fmfkid250](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fmfkid250/32/5973_2.png) [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)\ **Post date:** [August 27, 2007, 6:31pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/5 "2007-08-27T18:31:51Z")
I wouldent go any smaller then 3.5" even if was my daily driver!#@#$%@# Either that or i would leave it stock and get an electric cutout! and leave it quite! ---
**Author:** ![kilmer420](https://avatars.discourse-cdn.com/v4/letter/k/d6d6ee/32.png) [@kilmer420](https://forums.speedlife.net/u/kilmer420)\ **Post date:** [August 27, 2007, 8:22pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/6 "2007-08-27T20:22:14Z")
2.5 TBE have made 500whp, what’s your HP goal… ---
**Author:** ![discoSol](https://avatars.discourse-cdn.com/v4/letter/d/50afbb/32.png) [@discoSol](https://forums.speedlife.net/u/discoSol)\ **Post date:** [August 27, 2007, 10:26pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/7 "2007-08-27T22:26:28Z")
hell im runnin a gt2860rs and i have a 3"down pipe 2 1/2 intermediate pipe, and a 3" tail pipe… i feel shitty about running the 2.5 in there but i just welded that up fresh like less than a year ago, so i just made a new dp and tp which needed replaced anyways when i turboed… but i’d def go big hopefully i’ll be switching to a 3" ip soon. ---
**Author:** ![watacanga](https://avatars.discourse-cdn.com/v4/letter/w/85f322/32.png) [@watacanga](https://forums.speedlife.net/u/watacanga)\ **Post date:** [August 27, 2007, 10:44pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/8 "2007-08-27T22:44:22Z")
anybody have anything to say about the borla xr-1 muffler with custom piping from the cat back? and about how much is that going cost me??? i think it sounds amazing and it’s alot cheaper than anything else out there… i’m thinking somewhere around 300whp. if i go 3.5" am i going to lose all my bottom end power until i turbo it? my friend has like a 4" and she has problems on hills and it’s not lack of skill. ---
**Author:** ![discoSol](https://avatars.discourse-cdn.com/v4/letter/d/50afbb/32.png) [@discoSol](https://forums.speedlife.net/u/discoSol)\ **Post date:** [August 28, 2007, 8:35am UTC](https://forums.speedlife.net/t/exhaust-size/192058/9 "2007-08-28T08:35:18Z")
i was looking at that muffler for a while when i was piecing all my turbo stuff together… from what i hear its nice. I ended up getting a stainless 3" magnaflow with no tip and that thing sounds awesome. plus i like the no tip look, kinda not so flashy. ---
**Author:** ![fmfkid250](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fmfkid250/32/5973_2.png) [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)\ **Post date:** [August 28, 2007, 9:51am UTC](https://forums.speedlife.net/t/exhaust-size/192058/10 "2007-08-28T09:51:26Z")
4.5" ---
**Author:** ![TXcivic96](https://avatars.discourse-cdn.com/v4/letter/t/e9bcb4/32.png) [@TXcivic96](https://forums.speedlife.net/u/TXcivic96)\ **Post date:** [August 28, 2007, 7:11pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/11 "2007-08-28T19:11:06Z")
go all out, 5", No for real I’d run a 3" if your doing a full exhaust. ---
**Author:** ![imported\_strider](https://avatars.discourse-cdn.com/v4/letter/i/8c91f0/32.png) [@imported\_strider](https://forums.speedlife.net/u/imported_strider)\ **Post date:** [August 29, 2007, 3:04am UTC](https://forums.speedlife.net/t/exhaust-size/192058/12 "2007-08-29T03:04:10Z")
if your going to be n/a for awhile i would stick with stock exhaust until you get the turbo, you will lose a lot of bottom end to gain very little on the top by having 3" piping. anything over 3.5 is overkill unless your pushing 40-50 lbs of boost. a friend had the 2.5" oval xr-1 on his integra, had a deep tone compared to most other exhausts. ---
**Author:** ![fmfkid250](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fmfkid250/32/5973_2.png) [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)\ **Post date:** [August 29, 2007, 7:02am UTC](https://forums.speedlife.net/t/exhaust-size/192058/13 "2007-08-29T07:02:18Z")
> [@strider"](#): > > anything over 3.5 is overkill unless your pushing 40-50 lbs of boost. becasue you have been there right? even if your pushing 40psi on a t25?:blue: ---
**Author:** ![watacanga](https://avatars.discourse-cdn.com/v4/letter/w/85f322/32.png) [@watacanga](https://forums.speedlife.net/u/watacanga)\ **Post date:** [August 29, 2007, 7:56am UTC](https://forums.speedlife.net/t/exhaust-size/192058/14 "2007-08-29T07:56:18Z")
easy there fella’s lol. joe i saw your times for MIR, nice job but it sucks you just got edged out of first. what setup do you have on that car? ---
**Author:** ![7.5hotrod](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/7.5hotrod/32/5993_2.png) [@7.5hotrod](https://forums.speedlife.net/u/7.5hotrod)\ **Post date:** [August 29, 2007, 11:23am UTC](https://forums.speedlife.net/t/exhaust-size/192058/15 "2007-08-29T11:23:14Z")
3" is plenty… ---
**Author:** ![fmfkid250](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fmfkid250/32/5973_2.png) [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)\ **Post date:** [August 29, 2007, 11:40am UTC](https://forums.speedlife.net/t/exhaust-size/192058/16 "2007-08-29T11:40:36Z")
I would not run a 3" on any of my turbo cars, 3" Down pipe it ok then i would dump it to 4". Its alot better for your motor to not back anything up. 3" still restricts and builds up heat… I have been down this road and testing for years and every time i attempted to put a 3" on it drops boost pressure 2psi and i turn it and it looses a ton of power… check out members projects for my car updates i am running a 3.5" dp to a 4" pipe all the way back ---
**Author:** ![paNX2K\_SE-R](https://avatars.discourse-cdn.com/v4/letter/p/dfb087/32.png) [@paNX2K\_SE-R](https://forums.speedlife.net/u/paNX2K_SE-R)\ **Post date:** [September 1, 2007, 1:04pm UTC](https://forums.speedlife.net/t/exhaust-size/192058/17 "2007-09-01T13:04:23Z")
You can never have too big of an exhaust on a turbo car. I just switched from a Magnaflow mufler to a Borla muffler on the SE-R and I like the Borla a lot more. Its quieter, doesn’t drone, and sounds nice and deep.