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I have the same question, as I also live in California. I've considered all the possible mods but I'm just too lazy to make the switch every two years for testing. Today I am installing the catback exhaust system, but that will not void my smog requirements. I think I could get away with cat bypass on the second set because nobody ever looks under the car, and with a good engine I might - might - pass emissions even without those two cats. But intsalling headers and removing all four cats - no way.
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