Quote:
Originally Posted by Slalom RS
Which O2 sensor? I know there's one down before the cat. Probably wouldn't hurt to tighten the header bolts before that. Is there another one? I come from Hondas, and those O2s are right on the exhaust mani at the front.
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There are two o2 sensors, one is before the cat, and the other is right after the cat. I would turn your car on and just looke under the car to see if exhaust is coming out around where the header (if you replaced it or took it off while changing exhaust) and then also look at the connection between the header and the cat.