Quote:
Originally Posted by Taliyahk
Mechanic said they didnt see an exhaust leak though, I will have it looked at again though
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You probably need an exhaust shop to hook up a smoker to find any small leaks.
It would also be useful to look over many of the secondary cat delete threads here. I am not sure what they do with the downstream O2 sensor, but I suspect it may get replaced with a cheater plug that fools the ECU so you never get a code.