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Old 05-02-2008, 06:46 PM   #1
N1KN4K
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Member#: 175832
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Ortontuckey, MI
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2005 z51 Corvette
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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!
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Old 05-02-2008, 07:04 PM   #2
nick516
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http://forums.nasioc.com/forums/showthread.php?t=533787

should find everything you are looking for there
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Old 05-02-2008, 07:56 PM   #3
rxer311
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post in n/a thread?
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Old 05-02-2008, 08:22 PM   #4
wrxguy02
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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
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