I have the same sled, an 01 800 151 snowcheck, that was the last year of the non VES 800 - a great motor. Here's some things I've done (that I can remember) : SLP single, can, and porting, dash vents, ditch the sway bar, narrow ski stance, taller seat, '03 steering post and riser (get a post from wildchild instead - much better and he'll build it taller and with a tip up if you want), simmons skis, removed all of the foam from the hood, removed some bogey wheels and added scratchers. Get the clutching right, if you arent sure of it yourself it's worth every $ to pay someone that knows what they're doing. Check the runout. The older chassis takes alot more work to ride than the newer sleds, it's nowhere near as agile, but it will go every where the new stuff will with a little bit of skill (or maybe its a lot of luck!)