System has been engineered to provide increased air flow and less back pressure to help reach the trucks full potential in horsepower and torque. Muffler and inlet/outlet pipes are made from high-grade 409 stainless steel. Distinct aggressive sound / no in-cab drone or boom. Installation is quick and easy. Does not negatively affect emissions. 3 year limited warranty. Includes two sets of tips. Comes with Roush tips and extra set of custom "3.5 Twin Turbo" logo tips