This dual 2.75" diameter into single 3" Cat-Backâ„¢ 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 mandrel bent pipes ensure maximum flow for horsepower and torque along with an accurate fit. The muffler is specifically designed to give the 6.2L engine the classic S-Type sound without any drone inside the vehicle. The system features a 5" round black chrome on T-304 stainless steel tip. Using BORLAÂ 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. A system with a bright chrome on T-304 stainless steel tip is also available. This system can be adapted to the different wheel bases offered by Ford. 140798 includes the front extension pipe for the Crew Cab with Short Bed (6' 9") 160" Wheelbase configuration. By removing the front extension pipe it will fit the Regular Cab with Long Bed (8') 142" Wheelbase. Add PN 60691 for Extended (Super Cab) with Short Bed (6' 9") 148" Wheelbase PN 60692 for Extended (Super Cab) with Long Bed (8') 164" Wheelbase or PN 60693 for Crew Cab with Long Bed (8') 176" Wheelbase vehicles. NONE of these systems or configurations will fit trucks with dual rear wheels. BORLAÂ Cat-Backâ„¢ & Axle-Back exhaust systems feature patented straight-through and multi-core technology to unleash hidden horsepower. Increased exhaust velocity adds power driving excitement fuel economy and the distinctive BORLAÂ Sound of Power respected by motoring enthusiasts everywhere. Only T-304 stainless steel is used in the construction of BORLAÂ systems that allows us to give you a Million Mile warranty