Well, heard alot of good, alot of bad ,heres right outta the field findings. First of all the pipe is the first thing I have ever run from Bikeman. I have run the sled all year with the stock pipe and have been reasonably happy. Put the bikeman mod pipe on today and went for a day of riding and racing. Seat of the pants felt great and stronger all through. On the tach the pipe picked up 200 (8100-8300 plus) over the stocker. Against the usual sleds I test with it picked up the holeshot and mid range with a bit more top. Over all comparison it picked the sled up 2 or more ( I think more) lengths in 700 feet. The pipe works great