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      11-17-2012, 09:22 AM   #18
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Drives: 10' E92 M3 6MT
Join Date: Mar 2012
Location: SoCal

Posts: 170
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thia has been discussed bf as well. acm is kinda straight pipe but not really. bc they still take advantage if the Hemholt chamber in the stock muffler which some people believe helps eliminate the drone. again, its theory and im speaking from reading. no real experience
10' E92 M3 6MT
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