if you ride on a track and some dunes i would get some midrange pipes such as fmf fattys, or paul turner mids. I would prolly do a aggressive trail port or mx port..something that gives you some bottom end but doesnt take away that much from top end. Bump the compression (get a coolhead, or mill the head) advance your timing by +4 degrees with a timing plate and prolly get some pods, as long as you dont ride in mud or water. With those mods you should be rippin pretty damn good. Rebuilding it is just like your cr, if you have any questions there are guys on here that can troubleshoot damn near anything! just ask, you will get hooked up for sure.