I have GTM resonated test pipes and don't seem to have any issues. The CEL has only come on once after filling up. I just turned the gas cap several clicks and the light went off after a few days. It hasn't come on again since.
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GTM Stage 1 SC | GTM Test Pipes | Berk CBE | Swift Spec-R | Eibach Sways | SPL Rear Traction and Camber Links | ACT HD 6-Puck Clutch | Fidanza 15lb Flywheel | ZSpeed HD CSC |RJM AFP Clutch Pedal | Volk CE28N | Nismo GT Ti Knob
http://www.youtube.com/watch?v=TAd6s_W6ojE
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