Race Pipe
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This is a discussion on Race Pipe within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi. I have a 2004 WRX with turbo-back exhaust system 3'. I installed the race pipe with a new o2 ...

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    Arrow Race Pipe

    Hi. I have a 2004 WRX with turbo-back exhaust system 3'. I installed the race pipe with a new o2 senor on it now my eng light comes on with code PO420-Catalyst system efficiency below threshold. What did i need to do to stop the light from coming on??? Thanks for ALL your help

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    Quote Originally Posted by tttoys View Post
    Hi. I have a 2004 WRX with turbo-back exhaust system 3'. I installed the race pipe with a new o2 senor on it now my eng light comes on with code PO420-Catalyst system efficiency below threshold. What did i need to do to stop the light from coming on??? Thanks for ALL your help
    In order to run that turboback exhaust a tune is required. You're driving the car without one, and you shouldn't be.

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    I have the Cobb Accessport Stage 2 93

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    This seemed like it needed it own thread.
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