The 99 SnoPro when set-up right Will run right tight with the newer 500's. The 2000, 2001 SnoPro's actually have a slight advantage over the 500's.. It really comes down to who is taking care of the sled. Clutching, Belt, Studs, etc. I have owned all the Snopros since 1999. The clutching on the Snopros is usually spot on, and will give it the edge on holeshot.