Im a c class (trying to go to b class) hack like everyone else, the thing I noticed about the race tech stuff on an 03 cr was the valving charts supplied along with the piston, I think the piston is the eye candy that may have little effect and the valving recomendations are the difference in handling, I did the controversial midvalve check deal and the bike was noticeably easier to handle in the high speed chop with the rt setup, almost everyone i know who used rt after stock has said the same. anywhere else on the track i cant feel a difference from stock. Now I have a different bike with stock set up and am noticing the same harshness on highspeed stuff , may do it again to this bike, but would like to hear more on this topic about high/low flow before tearing into an mostly comfortable stock setup.