Originally Posted by kogs
Sorry, so your saying that with your experience even if you replace the oem up and downpipe with aftermarket ones like I have done I should get a pass?
Yes. For example. I'm running ecutek with a larger Turbo with supporting mods. I reinstalled my OEM up and downpipe and got new O2 sensors and passed. I believe the front sensor helps determine the fuel mixture. So a burnt out one could run you very rich. Causing higher hydro carbon readings.