Monster Exhaust System 5-inch Single Exit Black Tip 2017- 2019 Chevy/GMC 2500/3500 Duramax 6.6L L5P Banks Power5 inch 409 stainless steel constant diameter DPF back system with negative backpressure SideKick tip. 85 percent less backpressure and 15 percent lower exhaust exit temps than stock, allowing the engine to produce more horsepower. Improves flow and cuts backpressure. Includes Huge Polished Chrome SideKick tip. Banks Power introduces the new 5 inch Monster Exhaust designed specifically for the 2017 2019 GM 6. 6L Duramax L5P 2500 3500 HD pickup trucks.