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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"Arcadian, I've fought countless times, yet I've never met an adversary who could offer me what we Spartans call "A Beautiful Death." I can only hope, with all the world's warriors gathered against us, there might be one down there who's up to the task."Μολὼν λαβέ!!
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