This is not your average TNT 550. Ignition box programing was upgraded by Ski Doo Factory race tech, gave sled a ton more bottom end and mid range. Upgraded KYB piggyback shocks in the front and back. Rear skid frame shock is a clicker. C&A Pro skiis. Clutch kit, 96 studs. 770 miles. Very quick and handles great. Email or call with questions