Banks Monster Exhaust System 4-inch Single Exit, Cerakote Black Tip4 inch heavy duty stainless DPF back Banks Monster Exhaust system with constant diameter intermediate pipe and tailpipe. Exclusive CoolCuff design lowers tailpipe temperatures as much or more than stock while simultaneously improving flow and cutting backpressure. Tested and refined by Banks engineers using Computational Fluid Dynamics software, then validated through extensive temperature testing in all areas: before and after the DPF, 6 inch out