I have custom Turbo / Nitrous Pistons for the XP for sale I have 14 custom built from Wiseco.
Last year I was running 860 / Nitrous. Went back to stock bore. I am using Quantum Velocitys kit with the Tial SS V Band 2860. Hoping it will work out nice. here is the pictures of the pistons. Check at Lakeside motorcycle has them out there 403-746-3119 or you can contact me at rob@dirtydieselcustoms.com
absolute power (jared) put a turbo on my buddies xrs 860. Boom!!! Then he put the motor back to stock and with turbo. Boom also Got alot of free t shirts form the helicopter company. These guys are tryinh to make money selling kits. Imo you must have efi for a turbo if not a ton of tuneing experience. This friend of mine wasted a ton of money and a whole season of no sled