Heavy Duty Aluminized Steel. Up to 50 Percent Flow Increase. Smooth Mandrel Bent Tubing. 4 Inch OD Out Angle Cut Single Wall Tip Included.; Built to Perform MBRP's performance exhaust systems are built to perform. Designed to maximize exhaust flow and minimize exhaust temperatures your truck will use less gas last longer and perform better. Every system we sell has been built to the most exacting standards in the industry.; Dyno Proven; Your MBRP performance gas exhaust system has undergone countless hours on our in-house Mustang 1100 AWD-SE Chassis Dynamometer hundreds of miles on road and track and numerous tweaks and modifications to get the most out of your truck. From the vehicle specific muffler design to the fully mandrel bent tubing to minimal bend degree angles your MBRP performance system gets exhaust out fast. An MBRP performance exhaust system is the starting point to getting the most from cold air intakes programmers modules and downloaders.