My new (old) '87 700f2 came with a 4 to 1 system and it came with a gutted muffler. Sound incredibly loud and cool but my neighbors might have me arrested.:ballchain: Can anyone tell me what dictates the can you use besides exhaust pipe size? Can you use a pipe from a different style bike and rejet? I thought it had something to do with back pressure? Thanks for any lessons. This is what I'm working with.
