Slashes back pressure 40 Percent. Available separately or with Banks Monster Exhaust Stainless, 4 inch Monster turbine - outlet pipe with ceramic - matrix heat shield. Remove the final restriction to power. Banks Power Elbow assembly slashes the stock outlet and pipe backpressure by 40 percent. Available separately or with Banks 4 inch Monster Exhaust. Includes Cast, large - bore elbow housing Stainless, 4 inch Monster T.O.P. turbine - outlet pipe with ceramic - matrix heat shield Mounting hardware. Note Banks Brake and Banks Power Elbow cannot be used on the same vehicle.