Stock exhaust diameter on a 2003 WRX
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This is a discussion on Stock exhaust diameter on a 2003 WRX within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have a 2003 wrx and i want to install a catless 3" downpipe. I was wondering what the stock ...

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    Stock exhaust diameter on a 2003 WRX

    I have a 2003 wrx and i want to install a catless 3" downpipe. I was wondering what the stock exhaust diameter is because my exhaust is stock except for an HKS Catback. Thanks.

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    Moderator T0rque's Avatar
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    why would stock size matter if you have a cat back exhaust


    Lead Wrench @ WTF Tuning, LLC

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    Quote Originally Posted by T0rque View Post
    why would stock size matter if you have a cat back exhaust
    Well is the stock size smaller than 3 inches?

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    Master Baiter EJ257's Avatar
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    2.25"
    2005 WRX STi (Mods | Virtual Dyno)

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    Quote Originally Posted by EJ257 View Post
    2.25"
    Would it make sense to put a 3 inch down pipe on the
    2.25"exhaust?

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    Moderator Donkey's Avatar
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    Quote Originally Posted by DoubleM_95 View Post
    Would it make sense to put a 3 inch down pipe on the
    2.25"exhaust?
    You just said you have an HKS catback. So you don't have the stock exhaust. 95% of aftermarket downpipes connect directly to the catback.

    Resident Adviser @ WTF Tuning, LLC
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    Ok Thanks!

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    OMG WTF MainFrame's Avatar
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    Quote Originally Posted by DoubleM_95 View Post
    Would it make sense to put a 3 inch down pipe on the
    2.25"exhaust?

    It would make more sense to put a 4" bellmouth downpipe on it. That block off plate robs power.

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