Banks Power GM 454 Mh (EFI) - 209in-228in WB SS 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 454 Motorhome EFI, 209 Inch 228 Inch W B Wheelbases Key Features: Extension kit, stainless Includes 3. 5 inch x 45 inch Extension Pipe Includes 3. 5 inch x 24 inch Extension Pipe Includes heatshield and hardware CARB E. O. Not