I'm not too clear on your question.....What bike do you have? 88? If so, I don't believe the 88 and 89 pipes or even parts of them are interchangable. The 88 was air-cooled, while the 89 was liquid. The frame shape, plastics design, and pipe shape where different. If you need a new pipe, check out ebay. I just bought a pipe for my 89 for $10 the other day, so you will definitely be able to find one for your bike. I have seen fmf and stock pipes for the air-cooled kdx's on there too. Maybe you could clarify a bit more, and i'm sure we could help you out.