Challenge Street mid + M performance catback. Anyone?
View Single Post
02-03-2013, 12:50 AM
Drives: 2013 AW E92 M3 ZCP M-DCT
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.
View Public Profile
Find More Posts by kitw