Thread: 09 wrx cat back exhaust / down pipe / cat
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Old 05-02-2015, 02:08 PM
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JRecardo JRecardo is offline
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The cat is in your downpipe. If you buy an aftermarket downpipe with a high flow cat then you're all done. No further cats required.

Most catbacks will bolt up to the factory downpipe without much issue. I had an ultrex, and then Invidia catback on before changing my downpipe later on.
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MY08 WRX 325hp/456nm/18psi E85
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