Hooker has created a full line of adapter tubes that fill the gap and include all hardware and gaskets for a clean and simple connection. When connecting Hooker Long Tube Headers for the 68-69 Camaro/Firebird and 68-74Nova to our full exhaust kits, an adapter pipe is required to fill that gap between the end of the headers and our Hooker exhaust systems (which are designed to work with long tube header systems).