Dayco XTX5041 Drive Belt 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. The Dayco XTX belt offers: Faster and more consistent throttle response at high speeds Quicker throttle response at mid-speed acceleration