Banks Power GM 8.1L Mh-P - 208in WB Extension Pipe KitBanks 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, for use with GM 8. 1L P Series Motorhome, 208 inch W B Wheelbase. Key Features Extension kit, stainless Includes 4 inch Extension Pipe and all necessary hardware