A cooler-running temperature than the leading competitors Tested and proven reliability at well over 12,000 RPMs Better performance during deceleration (more responsive engine braking) Reduction in slippage during the highest levels of torque For 783cc Engine Dayco XTX (Xtreme Torque) ATV Belt:The most powerful belt built for the most Xtreme machines. Introducing Dayco's revolutionary XTX high horsepower drive belt. Bred from a rich history of experienced belt builders, the new XTX is specifically engineered to maximize the performance of high horsepower snowmobiles. Beating the competition on the CSRA race course is just one of many aspects that set the XTX belt apart from its competition. Specially formulated high temperature Polymer along with the highest level of engineered reinforcement proves to perform better in belt operating temperature and efficiency than leading competitors. Its innovative break-through design of deeper cogs on top and rounded cogs on the bottom yield the advantages of ultimate flexibility and longer belt life