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Originally Posted by j0n
your car has 4 o2 sensors in the exhaust from the factory...1 in front and behind each cat
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when talking about "exhaust" i mean a cat-back exhaust. lets say i buy a mangaflow cat-back and bolt it on to my car. no o2 are on the cut back itself (stuff that comes in the box) ... i know my car has 4 o2s i had to replace all of them...