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This is a discussion on Settle an argument for me? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Ok so I have 2.5in exhaust all the way back. I found a nice muffler w/tip that has a 2.25 ...

  1. #1
    Registered User ClosetSubyLover's Avatar
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    Settle an argument for me?

    Ok so I have 2.5in exhaust all the way back. I found a nice muffler w/tip that has a 2.25 inlet that opens up into a 2.5 main core.

    If I get one of those reducers you find at the autoparts store where the reduced section is only like an inch long, am I gonna be creating a noticeable restriction for my car?

    I have a Stage 2 COBB AP map flashed to it so im running a little higher boost and a buddy of mine is claiming Ill drop noticeable PSI from that couple inches of the inlet hole + reducer.

    Jw if he's gonna be saving me some money or if I know I can make a safe purchase and wont have to go through the hassle of sending things back

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  3. #2
    Registered User wreckingball man's Avatar
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    Highly doubt you will feel or create a noticeable restriction...not that far back in the exhaust and only .25 inches difference in diameter.

    Just for reference I ran a 2.5" catted stock muffler and midpipe with a 3'' downpipe, a larger restricition than you. I now have a full 3'' catless exhaust with a straight thru muffler. I don't notice any difference, not with the Cobb tune at least. What made the difference was the downpipe. Catbacks really have no effect on performance unless you're past stage 2 level mods, most gains are rather arbitrary with our power levels and with my new catback I could've tuned for a couple more horsepower, maybe 5-7Hp? It's really just for sound at this point.
    Last edited by wreckingball man; 08-22-2013 at 08:38 AM.

  4. #3
    Registered User ClosetSubyLover's Avatar
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    Quote Originally Posted by wreckingball man View Post
    Highly doubt you will feel or create a noticeable restriction...not that far back in the exhaust and only .25 inches difference in diameter.

    Just for reference I ran a 2.5" catted stock muffler and midpipe with a 3'' downpipe, a larger restricition than you. I now have a full 3'' catless exhaust with a straight thru muffler. I don't notice any difference, not with the Cobb tune at least. What made the difference was the downpipe. Catbacks really have no effect on performance unless you're past stage 2 level mods, most gains are rather arbitrary with our power levels and with my new catback I could've tuned for a couple more horsepower, maybe 5-7Hp? It's really just for sound.
    Yeah thats exactly my exhaust setup I have now. Cat-Less 3in DP into a 2.5in all the way back...

    Like I hate to keep repeating myself but if you were in my situation, this wouldnt bother you? There's a link below to what I was gonna get if it helps clear up anything for whoever else is lookin at this.

    http://www.summitracing.com/parts/mpe-14832/overview/
    Last edited by ClosetSubyLover; 08-21-2013 at 08:30 PM.

  5. #4
    Moderator Donkey's Avatar
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    Smallest I would run is a 2.5". The system as a whole matters once you upgrade the down pipe.
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  6. #5
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    Especially when you start putting down more power, the catback starts to matter more and more
    2013 WRX sedan - MODS = pretty much every bolt on besides a bigger turbo.

  7. #6
    Registered User wreckingball man's Avatar
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    this wouldnt bother you?
    It would bother me to have it reduce that small, yes. I would look for a muffler at least 2.5''

    You're looking for an upgrade so I would say at least go the minimum 2.5 diameter. However, is that 2.25 diameter reduction more restrictive than the stock muffler and cats?...I dont know. I still wouldn't do it though. It kind of defeats the purpose of an upgrade in my opinion.
    Last edited by wreckingball man; 08-22-2013 at 08:37 AM.

  8. #7
    Registered User ClosetSubyLover's Avatar
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    Quote Originally Posted by wreckingball man View Post
    It would bother me to have it reduce that small, yes. I would look for a muffler at least 2.5''

    You're looking for an upgrade so I would say at least go the minimum 2.5 diameter. However, is that 2.25 diameter reduction more restrictive than the stock muffler and cats?...I dont know. I still wouldn't do it though. It kind of defeats the purpose of an upgrade in my opinion.
    Ok thats kind of the answer I was looking for. Im probably gonna end up getting a 3in CBE later on down the road but for now since its fine the way it is I figure a muffler to help the sound is all im really looking at. Plus with the muffler Im getting it'll be a little less restrictive than the one on there now.

    After seeing these responses and talking to a buddy of mine its safe to say that you guys saved me about $120 so +1 for that. I woulda been kinda pissed to find this out after I had it in my hands.

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