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Originally Posted by cdru
There should be one before and one after the cat if it's like every other ODBII vehicle I've worked on. The one after is used to gauge the efficiency of the cat and to detect a problem. It should be fairly easy to look after the cat to see something screwed into the exhaust pipe. The sensor is about the diameter of your tumb and may be screwed into the cat, or just after the cat into the actual tailpipe. The upstream sensor, the one the computer uses mainly, is somewhere between the cat and the engine, usually closer to the engine then the cat.
Note that your current factory cat should have a 8 year/80,000 mile warranty. Replacing it with an aftermarket cat will obviously void that part of your warranty. Have you done some type of performance upgrade to your system? If not, replacing that new of a cat probably wouldn't give you any noticable amount of performance increase.
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how much horsepower would be gained putting on a hi-flow cat? if I can find one for an 05 cavalier and a 02 simulator to replace the factory so i can not throw any engine codes?