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      02-04-2013, 11:10 AM   #8
FogCityM3's Avatar
Drives: M3 (E90)
Join Date: Feb 2012
Location: San Francisco

Posts: 1,486
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On the M3 GTS 4, exhaust is wrapped after the headers and just past the differential. Wonder if you're running cats, wrapping from the secondary cat-back past differential will help at all in moving gases quicker/more scavenging.
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