Thread: Exhaust system database for the M3 and M4!
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      09-26-2014, 02:45 AM   #98
Mandi90TT
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Drives: BSM 6MT M4 F82
Join Date: Aug 2014
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I'm thinking any gains from an exhaust would come from the downpipes; other than that, the stock exhaust looks pretty free flowing.
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