I bought a steel Duplex for my 88/1100 before they stopped making them, but really wanted the stainless which wasn't available. Will the 89/92 pipe work for me? My guess is that it would work, but not fit quite right due to the different header length.? Matter of fact, the one for my bike didn't fit too good either. I had to trim the front fender, and raise the oil cooler slightly to make room for the duplex chambers. If anyone plans on putting a duplex on a first gen bike, I don't think the extra work is worth it. If I had known, I would have gone with the Hindle.