Turboback Exhaust
#1
Registered User
Thread Starter
Join Date: Jan 2004
Location: Maryland
Posts: 20
Car Info: 04 WRX, Silver
Turboback Exhaust
Question:
I have a MY04 with a Prodrive axle back. I have been looking for a downpipe with a high flow cat. Searched internet, and like the Cobb dp. I called Cobb, and asked if the Prodrive would bolt up to their dp. The answer was sort of a yes, with a but. The Cobb dp is 3", the Prodrive is 2.5". So there was some concern over the last stage of the exhaust going down to 2.5" and causing some restriction.
So regardless of what downpipe I go with, Turboxs, Helix, etc.......
Is there anyone out there running a similar set up, or do I really need to change the axle back to 3" too? Would there be that much of HP loss due the axle back?
I have a MY04 with a Prodrive axle back. I have been looking for a downpipe with a high flow cat. Searched internet, and like the Cobb dp. I called Cobb, and asked if the Prodrive would bolt up to their dp. The answer was sort of a yes, with a but. The Cobb dp is 3", the Prodrive is 2.5". So there was some concern over the last stage of the exhaust going down to 2.5" and causing some restriction.
So regardless of what downpipe I go with, Turboxs, Helix, etc.......
Is there anyone out there running a similar set up, or do I really need to change the axle back to 3" too? Would there be that much of HP loss due the axle back?
#3
VIP Member
iTrader: (9)
Join Date: Nov 2002
Location: ...a craphole in No.County San Diego
Posts: 3,928
Car Info: MMVI AW WRX STI
With the stock turbo, I'm sure you're not losing significant horsepower with a 3"->2.5" turboback instead of a full 3". Remember as air cools it gets smaller. And that the STi has a 2.5" exhaust.
#6
Just get the turbo xs stealthback exhaust. It comes witha down pipe and a mid pipe that tapers down from 4in. to 2.5in to bolt right up to the prodrive muffler. I have that setup and it looks and sounds great. I have been told that you loose maybe 5whp with this setup as aposed to a 3in. exhaust. I would only worry about hp loss with this setup it if you had 300whp or more. It all depends on what your future plans are?
#7
Registered User
Join Date: Feb 2004
Location: The Hunted Forest
Posts: 720
Car Info: Mazda Protege '02 (Wishing protege has AWD and a H6 twin turbo)
Originally Posted by Brfatal
You'd need a restrictor plate and you'd be robbing yourself of plenty of hp. I'd suggest selling the Prodrive and getting a 3" axleback or a full TBE.
Thread
Thread Starter
Forum
Replies
Last Post
WorldONE
Engine and Drivetrain
0
05-28-2008 10:51 AM
subaru_wrxwagon
Used Aftermarket Car Parts For Sale
5
01-06-2005 03:35 AM
bluewrxagon
Tri-State
7
03-13-2003 12:20 PM
CLsmooth71
Bay Area
2
12-09-2002 11:47 AM