for my 128i PE, the exhaust definitely softened up after a month or two, wish it didn't, but I'm satisfied with the sound now. Any kind of PE is a must if you appreciate the i6 sound.
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2010 128i manual, sport package, performance exhaust, Vorshlag camber plates, Bilstein B6 struts/shocks, 245/40/17 ZIII square on et 40 with rolled rear fenders.
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