I have been looking for a "backup" pipe for my son's KX80 and found a new Bill's pipe on a popular auction site. I checked Bill's website and found the pipe listings but they don't seem to supply any type of information on the characteristics of the pipe IE how it changes the power delivery etc. Does anyone have any idea's on how a Bills pipe would affect a 99 KX80? I would e-mail Bill's directly but is unlikely I will get a response before the auction ends.