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Originally Posted by RandallNeighbour
I discovered bypass pipes could earn me a trip to the muffler shop once a year to put the factory one back on to pass inspection. .
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I thought the muffler bypass pipes were post-cat ala the Porsche Sport Exhaust for a better sound. It seems that cat bypass pipes may cause problems with the state inspection but I have seen other postings where the first set of CATs are bypassed and supposedly in some states, it still passes emissions test and doesn't cause any CEL/MAF problems.