My 128i now has 2700 miles on it (put the exhaust on the day we brought it home) and it's definiely mellowed. At first I wondered if I'd gone too far, but it sounds great now.
My stock muffler did not have the damper, so maybe that was for an earlier model year.
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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