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  1. check engine light -catalytic converter cell-

    Subaru WRX Technical Support
    Hi everyone! I have a question, I own a 2010 2.5i sedan and I am running a Rallisportracing headers + Borla catback, and my check engine light went on after over a year of having them on, I took my car to my local shop, they told me is Catalytic converter efficiency problem, they suggested me to...