Banks Power Extension Kits are made from durable galvanized T - 409 Stainless Steel. These kits come with necessary hardware for the applications listed in their description. Exhaust Extension Kit, Stainless Steel, 4 inch for use with 1999 - 2003 Ford 7.3L, F250F350 CCSB, Crew Cab, Short Bed. Key Features Extension kit, stainless Includes 4 - inch Extension Pipe and all necessary hardware