Or, if your not worried about violating federal emissions laws, ditch the cat(s) and O2's behind the cats! 
o2's?
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o2's? I just got my car back from the shop, I had them do headers/cat/catback and they told me my rear o2 was bad so they replaced it. then I was under the car yesterday checking it out and..how many o2's am I supposed to have? cause I counted 4
1 after the cat, 1 before the cat and 1 on each side of the y pipe before the headers. 4 is not normal correct?
1 after the cat, 1 before the cat and 1 on each side of the y pipe before the headers. 4 is not normal correct? Replacing rear O2s with new ones is just stupid. They are noting but tattle tails for the cats. If one of them goes you replace a precat sensor and take the working precat sensor and put it behind the cat. That way you get the benifits of a new sensor in a position that actually affect how the engine runs..
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Replacing rear O2s with new ones is just stupid. They are noting but tattle tails for the cats. If one of them goes you replace a precat sensor and take the working precat sensor and put it behind the cat. That way you get the benifits of a new sensor in a position that actually affect how the engine runs..
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screw it I'l gut it and ditch emmisions
which is what I wanted to do anyways but that shop was to afraid to.. LS1 Tech Stories
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