5-inch 409 stainless steel constant-diameter DPF-back system. Patented negative backpressure SideKick tip helps lower exhaust exit temps by 15%. Improves flow and cuts backpressure by 89% from the DPF and 9% at the turbine inlet, allowing the engine to produce more horsepower. Includes Huge Polished-Chrome or Cerakote Black Patented SideKick tip. The 5-inch Monster Exhaust designed specifically for the 2011-2016 GM 6.6L Duramax LML 2500/3500 HD pickup trucks. The DPF-back exhaust system features constant-diameter 5-inch mandrel-bent Aluminized Steel tubing and a massive patented tip which virtually eliminates backpressure after the DPF and prevents trailer meltdown.Key Features: 5" 409 stainless steel constant-diameter DPF-back exhaust system. 15% reduction in exhaust temperature 2 feet behind the tip during regen. Huge patented 6.5" x 7.5" ob-round slash-cut exhaust tip. Chrome-plated stainless tip will not turn brown with heat. 89% less backpressure at the DPF than stock exhaust. 9% less backpressure at the exhaust turbine. Ob-Round Exhaust Tip Patent No. 5,581,111 S1. Fits trucks with aftermarket airbags. see fitment notes section above. 1-Year Limited Warranty