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I don't have npp, but I assume as well warranty won't fix it but I did ask the guy who works on warrantys at the Chevrolet I bought it from who said muffler delete is fine as long as I don't go past the cats with any mods. As much as I regret it the car sounded awesome til one week later when I believe the flaps broke, but does flaps being broke usually sound really bad? Cause mines sounds pretty bad now
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