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I put the flowmaster flow fx cat back kit on about 6 weeks ago and twice I’ve gotten the check engine light with the code P0402 which is the EGR valve is flowung more exhaust gases that it should. Has anyone else had problems when they switched their exhaust systems or should I just switch back...

Who else has the Roush cold air intake setup? I just put mine in a couple of days ago and was wondering how often I should clean it and how to clean it. I’m honestly not sure if its oiled or dry