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. HOOKER, HOOKER,When connecting Hooker Mid-Length Headers for the 67-69 Camaro/Firebird and 68-74 Nova 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 Mid-Length header systems).