Perforated vs ACM OEM Exhaust Mod
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11-17-2012, 12:50 AM
Drives: '11.5 E93 M3 AW, '09 R6
Join Date: Aug 2011
Location: Eagle rock, Ca
2011.5 E93 M3
Originally Posted by
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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