I bought a 800 F111 sled that was built by Bender complete. It came with a gear reduction and hand built formula 111 pipes with bellies like cornfed midwestern gurnseys. They were 10200 pipes and they were rare. I only seen a few sets to date. There was allot of R&D going on in those days with these sleds so theres all kinds of cool stuff floating around if you happen to find it. The quest continues and as you can see by reading some of the stuff these guys are doing in the current day, they still have there place in the fast sled world! Ronnie, they probably are formula 111 pipes but AAENS version. They were built for a formula 111 class race sled. Sherm, your 800 CDI will work at those r's but there are better timing curves out there