Welcome to the North American Subaru Impreza Owners Club Friday August 29, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-04-2004, 01:00 PM   #1
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default wrx exhaust for a 2.5??

Is it really true I can use a cat back exhaust for a WRX on my 02 RS? If so, which would be better (big hp gain, affordable, reliable)
Borla, Cobb or Stromung. As for the Stromung exhaust which mm do I go with --76 or 89?. Also would investing in Borla headers be a significant hp gain? I read average 10 hp and 14 lb/ft. True?!?
red22 is offline   Reply With Quote
Old 05-04-2004, 02:37 PM   #2
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

10hp with borla headers is stretching the truth i believe, the cobb headers would prob give you that

wrx exhausts will not work on our cars due to the size of most of their pipings(2.5"and +) the pre 01 rs exhausts will work on your cars though
piker28 is offline   Reply With Quote
Old 05-04-2004, 04:41 PM   #3
DreddRS25
Scooby Specialist
 
Member#: 51642
Join Date: Dec 2003
Chapter/Region: TXIC
Location: San Antonio, Texas
Vehicle:
2001 Impreza RS
BRP

Default

I own a MY01 RS 2.5l

Took off my axleback and had a shop weld a WRX axleback to my midpipe. (Was going to have a custom midpipe, lack of time and money) Made the exhaust sound a little deeper, and no real noticable gain in performance. Though, the twin tips looked and sounded better then my stock muffler.

Went back to the shop a month later for the midpipe to be put in. They took the flange that connects to the cat and put it on a 2.25" midpipe (no resonator) and welded the other end of the MP to the muffler. Again it deepened the exhaust note, however this time I could feel it accelerate better through the rpm band. No gain...No loss in power, definately smoother. If you go with the whole WRX cat-back then you might lose a little back pressure in the midpipe due to the larger diameter. Stay close to 2.25 from cat-back.

In short a WRX will not hamper your performance nor net you much of a gain. Though, it frees up the exhaust a little and deepens the exhaust sound nicely. Also, you will have to have a shop install it or someone who is very handy with welding.
DreddRS25 is offline   Reply With Quote
Old 05-04-2004, 05:07 PM   #4
elijah25rs
Scooby Specialist
 
Member#: 59711
Join Date: Apr 2004
Chapter/Region: NWIC
Location: Portland, OR
Vehicle:
2005 WRX
Crystal Grey Metallic

Default

N/A cars respond better to higher backpressure. I believe that a WRX exhaust will lower that from a stock RS.

Borla headers will not give you that much. Cobb's are more likely in that range.

I would go with the Stromung. Does anyone know the gains for the Cobb exhaust.
elijah25rs is offline   Reply With Quote
Old 05-04-2004, 05:23 PM   #5
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

Quote:
Originally posted by DreddRS25
I own a MY01 RS 2.5l

Took off my axleback and had a shop weld a WRX axleback to my midpipe. (Was going to have a custom midpipe, lack of time and money) Made the exhaust sound a little deeper, and no real noticable gain in performance. Though, the twin tips looked and sounded better then my stock muffler.

Went back to the shop a month later for the midpipe to be put in. They took the flange that connects to the cat and put it on a 2.25" midpipe (no resonator) and welded the other end of the MP to the muffler. Again it deepened the exhaust note, however this time I could feel it accelerate better through the rpm band. No gain...No loss in power, definately smoother. If you go with the whole WRX cat-back then you might lose a little back pressure in the midpipe due to the larger diameter. Stay close to 2.25 from cat-back.

In short a WRX will not hamper your performance nor net you much of a gain. Though, it frees up the exhaust a little and deepens the exhaust sound nicely. Also, you will have to have a shop install it or someone who is very handy with welding.
im pretty sure he meant a aftermarket catback made for a wrx not the normal wrx catback
piker28 is offline   Reply With Quote
Old 05-04-2004, 05:25 PM   #6
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default

where is a good play to buy cobb headers? my search engine couldn't find a place
red22 is offline   Reply With Quote
Old 05-04-2004, 05:29 PM   #7
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

cobbtuning.com i believe but be ready for the pricetag
piker28 is offline   Reply With Quote
Old 05-04-2004, 06:24 PM   #8
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default

no thank you!!! pricey!! i think I'll go with the $300 borla header!!!! as for the cat back exhaust--cobb or borla? the borla is for wrx. as for Stromung which one do i want???76 mm 89 mm?
new to the techi stuff!!
red22 is offline   Reply With Quote
Old 05-04-2004, 06:29 PM   #9
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

do not go bigger than 2.25 piping for your exhaust

and although cobb is pricey you will get the most gain from that header
piker28 is offline   Reply With Quote
Old 05-04-2004, 06:34 PM   #10
Nicklbrso
Scooby Specialist
 
Member#: 44887
Join Date: Oct 2003
Chapter/Region: NESIC
Location: ME
Vehicle:
00 GC6
Silver

Default

Quote:
Originally posted by piker28
do not go bigger than 2.25 piping for your exhaust

and although cobb is pricey you will get the most gain from that header
Very true and very important
Nicklbrso is offline   Reply With Quote
Old 05-04-2004, 07:08 PM   #11
mycarsux
Scooby Specialist
 
Member#: 32049
Join Date: Jan 2003
Chapter/Region: SCIC
Location: Fullerton, CA
Vehicle:
2002 2.5RS slowbaru
+Canon 5D & 30D

Default

ya, i got borla headers, and i can tell you that the most thing u will get out of it is the sound. makes a nice rumble and stuff, but very little if any power gain. as for a catback made for a wrx, i believe the only thing u can use is the muffler because the midpipe is shorter on the wrx compared to the rs (correct me if im wrong). just get a custom midpipe (its cheaper anyways) and watever muffler you want. my whole cat back cost me about 300 dollars (custom midpipe, apexi resonator that was cut off from a different midpipe, and apexi n1 muffler). of course, i got the muffler from apexi garage sale, so i got it for a cheap price.
mycarsux is offline   Reply With Quote
Old 05-04-2004, 07:11 PM   #12
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default

what are some other good mufflers? good deep sound with some hp gain??
red22 is offline   Reply With Quote
Old 05-04-2004, 07:18 PM   #13
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

-prodrive
-scooby sport
-stromung
-brullen
piker28 is offline   Reply With Quote
Old 05-04-2004, 07:27 PM   #14
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default

what about a cobb cat back?
red22 is offline   Reply With Quote
Old 05-04-2004, 07:51 PM   #15
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

thats good to

but if you were moanin about price on the headers what makes you think the cat back is so cheap?
piker28 is offline   Reply With Quote
Old 05-04-2004, 07:56 PM   #16
red22
Scooby Newbie
 
Member#: 61008
Join Date: May 2004
Vehicle:
2002 Impreza
black

Default

I am now looking at mufflers and getting a custom midpipe. Stromung looks appealing, hp gain ad ~350 anyone have a stromung muffler and can give me some reviews
red22 is offline   Reply With Quote
Old 05-04-2004, 08:02 PM   #17
piker28
Scooby Guru
 
Member#: 22664
Join Date: Aug 2002
Location: north nj
Default

if i were to do it again i would buy the whole catback instead of getting a custom midpipe made but thats just me

your crazy with this hp gain i mean no exhaust will really give you anything insane that youd feel if you want powaaaa look at cams and stuff
piker28 is offline   Reply With Quote
Old 05-04-2004, 08:29 PM   #18
blueimpreza25rs
Scooby Specialist
 
Member#: 21821
Join Date: Jul 2002
Chapter/Region: Tri-State
Location: Jersey
Vehicle:
2008 Cadillac CTS4
Black Cherry

Default

or if you dont want to start hardcore w/ cams...high flow cat ...or catless
blueimpreza25rs is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB: stock 2.5RS exhaust for 2000 2.5 RS slowguy VIC Private Classifieds 4 07-26-2007 09:41 AM
How is the Borla exhaust for the 2.5 rs? Polishguy701 Normally Aspirated Powertrain 5 03-12-2004 03:54 PM
best exhaust for a 2.5? ksubaru826 Normally Aspirated Powertrain 25 12-04-2003 05:28 PM
wtb exhaust for my00 2.5 RS xian Private 'Wanted' Classifieds 2 10-15-2003 12:15 AM
Best sounding exhaust for MY02 2.5 RS? 02wrx Newbies & FAQs 2 11-18-2001 07:09 AM


All times are GMT -4. The time now is 06:25 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.