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      12-21-2008, 06:25 PM   #3
ace996
NASA/PDA Instructor
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Drives: E92M3
Join Date: Aug 2008
Location: Long Island

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I have suspicions that the inside of the stock muffler has no insulation, just metal baffling. Taking the top skin off and "bypassing" the baffles has been done on other cars...should work for the M3, too.
Give it a shot...
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