When does 2.5 inch exhaust become restrictive
07 May 2007, 01:20 PM
#1
Scooby Regular
Thread Starter
iTrader: (6)
Join Date: Apr 2005
Location: Stroke it baby!
Posts: 33,828
Likes: 0
Received 0 Likes
on
0 Posts
When does 2.5 inch exhaust become restrictive
Having a rebuild done, and currently have full 2.5 decat (H&S), will this hamper my performance.
Looking around for 3 inch or bigger but will mine do for now
The headers are ported OE items
Cookie
Looking around for 3 inch or bigger but will mine do for now
The headers are ported OE items
Cookie
07 May 2007, 01:27 PM
#2
Moderator
iTrader: (4)
Join Date: Jul 2004
Location: The Terry Crews of moderation. P P P P P P POWER!!
Posts: 18,687
Likes: 0
Received 0 Likes
on
0 Posts
Circa 350bhp I believe mate, if my recollection of prev threads on the subject is accurate. I don't think it's set in stone though!
Ns04
Ns04
Trending Topics
mangetout, mangetout !!
08 May 2007, 07:16 AM
#12
Andy Forrest advised me in the early days while I searched for 380 bhp on a stock Sti 2 litre.
Over 350 fit a 3'' (Revolution makes a very good one)
Stock headers are fine, Stainless headers are good for top end bhp, ported headers are great for mid/low end torque with a little off the top bhp.
David does ported headers for little $$$ so fit a set!
You biggest question must be De cat or Sport Cat?
Graham.
Over 350 fit a 3'' (Revolution makes a very good one)
Stock headers are fine, Stainless headers are good for top end bhp, ported headers are great for mid/low end torque with a little off the top bhp.
David does ported headers for little $$$ so fit a set!
You biggest question must be De cat or Sport Cat?
Graham.
08 May 2007, 09:29 AM
#13
Scooby Regular
iTrader: (2)
Join Date: May 2000
Location: Class record holder at Pembrey Llandow Goodwood MIRA Hethel Blyton Curborough Lydden and Snetterton
Posts: 8,626
Likes: 0
Received 0 Likes
on
0 Posts
I think to get the most out of a 321T you'll have to change the headers.
John Banks is the one to ask about the 2.5" system, IIRC on a thread of his a 2.5" coped with 400
John Banks is the one to ask about the 2.5" system, IIRC on a thread of his a 2.5" coped with 400
08 May 2007, 01:29 PM
#14
Scooby Regular
iTrader: (1)
Join Date: Aug 2002
Location: Bridgnorth with the Steam trains
Posts: 695
Likes: 0
Received 0 Likes
on
0 Posts
I had a 2.5" Firestorm system on my car before the rebuild and it was rolling roaded at 382 bhp,It's for sale at the moment,it's on the shelf next to your car mate 
Thread
Thread Starter
Forum
Replies
Last Post
fatboy_coach
General Technical
15
18 June 2016 03:48 PM
