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      05-01-2014, 08:59 PM   #21
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Drives: E92 M3
Join Date: Dec 2013
Location: Denver

Posts: 6
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Their x-pipe has a very refined sound. Basically all upside from stock. No drone (at all), without question improved sound and enhanced performance. Experienced drone on exhausts that others claimed had none, and this one doesn't. Stock catback here.
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