Challenge Street mid + M performance catback. Anyone?
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02-03-2013, 01:50 AM
Drives: 2011 E92 Jet Black M3 (#6!)
Join Date: Jun 2007
Location: Bay Area, CA
I've found that resonators do cut down on the rasp somewhat, but not completely. I really don't think removing the secondary cats is worth it, I think it's always better to remove the primaries with a $400 test pipe.
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