i got the reg mbx5 for $405 on bay. really i know you all talk -"get the prospec" but i visit the grid often and there are many pros that race there and they all told me get the reg. the only reason i got the kings kit is cause i traded a ws7 for all of it. really the chassis could use a little more flex so the reg braces would allow that. id just get seated in the reg and go race. carolinas r/c has the new diff o-rings and the k-factory hinge pins to make it the ultimate r/c for racing. the pins have no e-clips and the rings are so the diffs wont leak.