01-04 Chevrolet/GMC 2500/3500 EC/CC 6.6L Duramax, Armor Lite 4-Inch Cat-Back Single Side Exit, with Carb Approved Downpipe, MBRPDoes your 2001 2004 Chevrolet GMC 2500 3500 6. 6L Duramax require a replacement exhaust? We've got you sorted, install MBRP's S6001P! The S6001P features a 4 inch Cat back single side exit along with a carb approved downpipe. Constructed from heavy gauged aluminized steel, this substance is cost effective and ideal for mild environments. By using smooth mandrel bent tubing, the S6001P provides a more direct flow path, enhancing your engine's