Downpipe question
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This is a discussion on Downpipe question within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; The stock downpipe has a cat on it right? Would I get the same effects if I were to gut ...

  1. #1
    Registered User SubiEj255's Avatar
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    Downpipe question

    The stock downpipe has a cat on it right? Would I get the same effects if I were to gut my stocker as getting an aftermarket one?
    A car is only as good as its driver

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by SubiEj255
    The stock downpipe has a cat on it right?
    Yes

    Quote Originally Posted by SubiEj255
    Would I get the same effects if I were to gut my stocker as getting an aftermarket one?
    No
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  4. #3
    Registered User SubiEj255's Avatar
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    Why not? Size differences?
    A car is only as good as its driver

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    OMG WTF MainFrame's Avatar
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    Size differences, and block off plate.. flat plate blocking the IWG exit is ghey.

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    Registered User SubiEj255's Avatar
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    Is there a difference between cat and catless aftermarket ones?
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    OMG WTF MainFrame's Avatar
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    Yes.. catless is less restrictive, therefore capable of producing more power (also louder). A catted downpipe will generally be more expensive because of the material catalytic converters are made out of. The advantage to catted would be that you would be more likely to pass a visual safety/emissions inspection, and in the later year models fully catless exhausts can cause boost creep issues where as catted downpipes seem to prevent boost creep (for the most part).

  8. #7
    Registered User SubiEj255's Avatar
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    Yea that was the ONLY reason I was considering a catted dp; for the visual emissions inspection. These cars only have one cat?
    A car is only as good as its driver

  9. #8
    Registered User UEDan's Avatar
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    2. You'll need both to pass a sniffer test.

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    OMG WTF MainFrame's Avatar
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    2L WRX has three, 2.5L has two.

  11. #10
    Registered User SubiEj255's Avatar
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    Here in md they don't do the sniffer on newer cars.
    A car is only as good as its driver

  12. #11
    Registered User SubiEj255's Avatar
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    Where is the other cat? In the catback?
    A car is only as good as its driver

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    Downpipe question

    The cat came back, the very next day.

  14. #13
    OMG WTF MainFrame's Avatar
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    Quote Originally Posted by SubiEj255 View Post
    Where is the other cat? In the catback?


    In the downpipe (or midpipe if you get a shorty DP). The term "catback" literally means, from the catalytic converter, back.

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    UnBanned Sinister's Avatar
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    Quote Originally Posted by Teamdiedrich View Post
    The cat came back, the very next day.
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  16. #15
    Registered User SubiEj255's Avatar
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    I know this is old, but no one told me where the 2nd cat was.
    A car is only as good as its driver

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