I finally got my sled, it is a 2000 ZL500 EFI with 1300 miles on it for only $2200. It is in perfect condition. The reason I was asking so many questions is because I wanted to know what kind of upgrades each sled could have done. Thanks for all of the replies. Well here is another question I've read about people having trouble with the tether switch, did it ever happen with this sled? Also how did these sleds perform? Thank you.