How much do they charge??? I have a '97 220 with fmf rev,tc II, reeds,and a weisco. Seems like a popular mod for the kdx's. What do they do to it(does it include rejetting to the proper jets) and what area will it improve? I would think it would help out the low end.....which is something that is lacking a tad bit since the rev install. Oh-yeah, how long do they take to do it?