aFe MACHForce XP Exhaust Aluminized Dual Split DPF Back 11-15 GM Diesel Truck V8-6.6L (td) (BLK tip)aFe MACHForce XP Exhaust Aluminized Dual Split DPF Back 11 15 GM Diesel Truck V8 6. 6L (td) (BLK tip) Interested in a new exhaust system for your LML Duramax? Check out the ATLAS Dual DPF Back exhaust system by aFe. This system is constructed from 4 in. mandrel bent aluminized steel tubing and uses high quality band clamps and OE style bayonet hangers. This unit uses all factory mounting locations and comes with a bolt on bracket that supports the