exhaust size

The end of the pipe will be 2 1/2" outside diameter. The inlet of the muffler will be 2 1/2'' inside diameter and should slide over the end of the pipe with no more than a light tap with a soft faced hammer. You can clamp or weld as you see fit. The band style clamps do work great and give you the option to change mufflers and pipes without cutting everything apart. Good luck!
toolmanmike