Thread: WTS: Hartge quad exhaust for E82/E88 135i N55/54 with hartge diffuser
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      12-31-2012, 01:50 AM   #17
Wkwlb
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Drives: 2010 135i 2012 M5 2015 F56
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Different sound clips from youtube for your reference, still sounds better in person and under load.
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