I have an 85 and tried to use a newer pipe but the fit around the lower left side of the frame is to tight. The stock 85 pipe is straight out to the left side of the bike, and the 88 and newer pipes wrap back and there is some work that would need to be done to it in several spots to fit. I use a pro circuit pipe and a stock 2000 muffler, you have to cut about an inch of the muffler to fit over the pipe. It still fits a little tight but works great.