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Like others have mentioned keep it simple if you are worried about your warranty. Axle back and a CAI if you're so inclined. For me the best upgrade was the Katzkin leather kit. The original upholstery drove me nuts. That fabric must have been picked by someone who enjoys riding around on 80 grit. Maybe it wouldn't have bothered me when I was younger, but now I'm old and spoiled. I paid $900 for the kit, removed the seats myself, and paid a local shop $500 to swap on the leather. The difference in comfort is night and day.
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2021 LT1, A10, RotoFab CAI, Flowmaster American Thunder axle back exhaust, JLT catch can, Katzkin leather interior.
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