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      09-12-2012, 07:55 PM   #23
Zebra99
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Drives: 2011 335is E93
Join Date: Aug 2011
Location: Ontario

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Some shop out in the states somewhere (very vague, haha) did this for the M3 guys and it was the same deal...

I believe they changed the packing/insulating and replaced the perforated pipe with a straight pipe.