05 Chevrolet/GMC 2500/3500 EC/CC 6.6L Duramax, Armor Lite 4-Inch Cat-Back Single Side Exit, with Carb Approved Downpipe, MBRPIs it time to consider a new exhaust for your 2005 Chevrolet GMC 2500 3500 6. 6L Duramax? We've got you sorted, install MBRP's S6003P! The S6003P is a 4 inch Cat back single side exit exhaust kit that also includes a carb approved downpipe. Constructed from heavy gauged aluminized steel, this material is cost effective and ideal for mild environments. By using smooth mandrel bent tubing, the S6003P provides a more direct flow path, enhancing your