i think xtreme does and felkers up in longmont does heard felkers know there stuff but dont ride skidoos so dont know 4 shure iam shure some skidoo riders will charm in here and help u good luck
Rick at Peak Powersports is riding his 860 kit in his XP this year. I have ridin his 840 kit for two years now. Super strong and reliable. I think he is building 860 kits for extreme now.