This would make a good upgrade for your sled. I've got one of these on mine and the ride is really an improvement from stock.
http://cgi.ebay.com/ebaymotors/Snow...20101111QQptZSnowmobileQ5fPartsQ5fAccessories
Shark
http://cgi.ebay.com/ebaymotors/Snow...20101111QQptZSnowmobileQ5fPartsQ5fAccessories
Shark