i don't think you should have had those mods (3" IC piping, big fmic, turbo-back exhaust) without a tune. my dealership's service manager told me catback is fine for exhaust, but once you start tinkering with the downpipe/cat that you lose motor warranty. it does effect spooling so its reasonable. find an oem downpipe, revert to stock, and take it in. you have more to gain than you have to lose. and if you are denied a warranty claim, you have a lot to lose.
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not stock
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