SMALLER IS BETTER? 3.5' DOWNPIPE FITS BETTER (part A) shorts shortvideo diesel trucks downpipe Lbz Downpipe Back Exhaust
LBZ Duramax Mbrp 4" before & after Stock vs. 4" MBRP stainless. Also: Garrett stage 1, MBRP downpipe, EFI Live (Idaho Rob tunes), EGR capped and removed, 2001-2007 Duramax Exhaust Systems | Dirty Diesel Customs ...