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      11-16-2012, 11:50 PM   #15
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Drives: '11.5 E93 M3 AW, '09 R6
Join Date: Aug 2011
Location: Eagle rock, Ca

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2011.5 E93 M3  [0.00]
Originally Posted by X2Board View Post
Perforated, unless you like loud all the time. I drove both and the ACM method does drone a bit, so the claim of zero drone is not accurate.
ACM AKA Bypassing the muffler will create a "drone" sound.
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