Quote:
Originally posted by Cancivicd16
Why can't I just take the cat out and put the O2 sensor in the replacement pipe. I don't see how this would mess with the engine light or the timing since the O2 is upstream from the cat. I want to do this because I have a resonator in my cat-back, so my exhast is pretty quiet, and I want a louder exhast with a little extra hp. Removing the cat seems like the most logical step since I want to keep the resonator. Am I all wrong here or what?
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oh you could put the o2 sensor in the new test pipe but unfortunatly it will not return the same value it would if the cat was there thus giving you a CEL for a malfunctioning cat. i think apexi has a thing that sends back the right voltage for the secondary o2 sensor so you can remove the cat but like jon said its worthless, if you dont a much larger flow that is being bottlenecked by the cat then you arent gonna get anything or very little at that.