Since November I have been tring to figure out just what these pipes are. I bought them sometime around thanksgiving, thinking that they were the fmf fattys. It turned out that they are old pipes. However these pipes are strange. Almost everyone I see at the dunes that has they has a dent under the pipe, in the same place as mine. I also found people with another old fmf pipe that has a different curve in the pipe. The way they perform is great though. So far I have out raced (drag raced) banshees with DMCs Fmf Fattys Toomey t-5s.The power of these pipes suprise me concidering the age of them. Does anyone have these pipes or know anything about them(when made, other performance info)? I paid $80 for mine. here is a picture of one on ebay.old pipe