Welcome to the North American Subaru Impreza Owners Club Friday January 19, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC General > Newbies & FAQs

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. 
Thread Tools Display Modes
Old 05-02-2008, 07:46 PM   #1
Scooby Newbie
Member#: 175832
Join Date: Mar 2008
Chapter/Region: BAIC
Location: NorCal
2005 z51 Corvette
LeMans Blue

Question Custom Exhaust Advice

Hi all,

I'm brand new here and have owned my first subie for about 8 months now. It is a 2007 Impreza 2.5i. I've been lurking in the forums for quite a while but am not just beginning to post. The only mod currently on it my car Williaty's hybrid intake. I'm looking to put my next one on, and I would like that to be a custom exhaust.

I've got a reputable local shop that is able to fabricate one for me, but I wanted some advice on the specifics.
1. I've heard of two different suggested sizes for the NA motors 2.25 in and 2.5 in, what difference can I expect to see between the two? I've heard that the general consensus is 2.25 is better, why is this?
2. I want to put a high flow cat on and was wondering if there are any other specs that pertain to cats in relation to my car that I need to be aware of when discussing it with the shop. OR would I be better off going catless? Keep in mind I'm married and if the car is too loud my wife will go ape ****. Will a catless or a highflow cat cause problems with the noise issue.
3. Along the same lines, while I would like the small power gains out of the exhaust system, I also am doing it for sound. I'm not trying to be one of those people that asks "whats the best muffler," but ive been through the Exhaust/CAI thread with pics and vids and its all just overwhelming to me. Is there one or a couple relatively popular mufflers which you would suggest that I could research more in depth looking for the sound I want. I'm searching for more of a low rumble sound, but keep in mind as ive said above, I dont want something too loud, maybe a bit louder than stock.
4. Is there anything else I should keep in mind while going to talk to the tech which I haven't covered here? I can't guarentee they will be familiar enough with subies to catch something my inexperience misses.

Thanks all for your help!
* Registered users of the site do not see these ads.
N1KN4K is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-02-2008, 08:04 PM   #2
Scooby Specialist
Member#: 178134
Join Date: Apr 2008
Location: Long Island New York
2004 jbp wrx wagon
java black



should find everything you are looking for there
nick516 is offline   Reply With Quote
Old 05-02-2008, 08:56 PM   #3
Scooby Specialist
Member#: 107099
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: Lancaster, PA
'07 STI
Satin White Pearl


post in n/a thread?
rxer311 is offline   Reply With Quote
Old 05-02-2008, 09:22 PM   #4
Scooby Specialist
Member#: 174672
Join Date: Mar 2008
Chapter/Region: South East
Location: Greensboro, NC


just buy one.

major companys spend ALOT of money in designing and testing exhausts for vehicles, your not going to get anywhere near the quality of a diy/custom made exhaust.
theres a reason why a exhaust has that little bend in it at that random spot, why you ask? well i have no clue cuz im not a exhaust fabricator for a major exhaust company, but they wouldnt put it there for no reason.

ive always heard this rule, for a 4 banger n/a motor...
2.0L and lower-2.25 inch exhaust
over 2.2L- 2.5 exhaust

why i dont know... im not a exhaust designer, i just trust companys hard work in designing and testing.

just my $0.02
wrxguy02 is offline   Reply With Quote

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
First log with my custom exhaust *ADVICE* CenCali07sti Open Source Reflashes 8 01-21-2008 01:24 AM
custom exhaust idea: need advice! stealthWRX68 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 6 11-21-2007 07:49 AM
Looking for custom exhaust adviceÖ xcntrk75 Legacy Forum 19 04-12-2005 07:01 PM
Custom Exhaust - Skips Exhaust Plaistow NH WRXBanish New England Impreza Club Forum -- NESIC 3 11-14-2003 07:50 PM
Trade! my custom Exhaust on your RS Exhaust! SONofSAM Bay Area Impreza Club Forum -- BAIC 7 04-13-2002 03:15 PM

All times are GMT -4. The time now is 12:27 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.