11-15 Chevrolet/GMC 2500/3500 EC/CC 6.6L Duramax, Armor Lite 4-Inch Filter-Back Single Side Exit, with Carb Approved Downpipe, MBRPYour 2011 2015 Chevrolet GMC 2500 3500 6. 6L Duramax deserves an update, and we've got you covered, install MBRP's S6050PLM! The S6050PLM is a 4 inch filter back single side exit and 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 and omitting a muffler, the S6050PLM provides a more direct flow path, enhancing your