This Cat-Back? system was developed for use on F-250 and F-350 Super Duty trucks with performance, sound, style and durability in mind. The computer numerical control (CNC) formed pipes ensure the best possible flow for horsepower and torque. The muffler is specifically designed to give the 6.2L engine the sound an enthusiast would enjoy without the resonance (drone) that they don't. Only T-304 stainless steel is used in the construction of Borla? systems, that allows us to give you a Million Mile warranty. These systems can be adapted to the different wheel bases offered by Ford and come with either a black chrome on T-304 stainless steel (140798BC) or bright chrome on T-304 stainless steel (140798) tip. Using BORLA? Stainless Steel Polish p# 21461 is NOT recommended with these black chrome tips. We suggest cleaning the tips with hot water and a microfiber cloth.