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      02-10-2011, 11:55 PM   #81
Drives: 2011 335i Coupe M-Sport
Join Date: Apr 2007
Location: Westchester, NY

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Originally Posted by zhangzeyuandss View Post
most likely they still use Helmholtz chamber the stock exhaust. this could get rid of the drone in low RPM range.
Doesn't the dinan exhaust elminate drone too? They're not big like this. My god, these better come with built in speakers too lol.
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