Monster Exhaust System for 11-15 Chevy/GMC 2500/3500 and (16 2500 Only) 6.6L Duramax LML (SRW) Black Tip Banks Power5 inch 409 stainless steel constant diameter DPF back system. Negative backpressure SideKick tip helps lower exhaust exit temps by 15 percent. Improves flow and cuts backpressure by 89 percent from the DPF and 9 percent at the turbine inlet, allowing the engine to produce more horsepower. Includes Huge Polished Chrome or Cerakote Black SideKick tip. The 5 inch Monster Exhaust designed specifically for the 2011 2016 GM 6. 6L Duramax LML 2500 3500 HD