The pulley is a direct bolt on using the factory belt. Using the same diameter as stock, the AP pulley weights about 1.1lbs compared to the stock pulley weighing in at 4lbs. The weight savings in rotational mass equates to serious performance increases. Quicker throttle response, improved rev matching, and more for the serious performance driver. The factory harmonic balancer reduces engine noise and vibration in the cabin and deleting this will NOT destroy your motor. The pulley is completely safe as a bolt on giving you between 3-6 horsepower. Tested and used on the Time Attack, Drag, and Street EVO’s, this mod has proven it’s success on many vehicles world wide.
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