Banks Power 08-10 Ford 6.4L (All W/B) Monster Exhaust System - SS Single Exhaust w/ Black Tip4 inch constant diameter DPF back. Improves flow up to 50 Percent and cuts backpressure up to 40 Percent, allowing the engine to produce more horsepower. Includes Huge Polished Chrome or Cerakote Black Patented SideKick tip. The Banks Monster Exhaust is engineered using computational fluid dynamics (CFD) software then tested on both dyno and on road. Reducing backpressure allows the engine to expel spent gasses with less effort. Less pumping loss