You will need to put a pipe an muffler or a slip on, nerf bars, kill switch, 20" front tires and 18" rear you might want to look at some suspension work shocks, a-arms, axle and the list goes on, depends on how much you want to spend and howfar you want to go.do you know some tips for making a 300ex a racing quad becouse i ride at a mx track alot with my dirtbike and my 300 is stock and i want to do some work with it but dont know much.thanks