Heavy Duty Modified Street Clutch Kit

The ACT ZM3-HDMM Heavy Duty Modified Street Clutch Kit is engineered for enhanced performance and longevity. This kit features ACT's renowned Heavy Duty pressure plate, which utilizes an exclusive diaphragm design to increase clamp load, reduce deflection, and extend clutch life. The pressure plate's cover is precision stamped for rigidity and consistent performance. Complementing the pressure plate is a modified street disc constructed with a premium organic friction material high in copper content for superior heat transfer and a steel-backed lining for increased burst strength and durability. The disc is modified with reduced marcel for faster shifting action. Heavy-duty torsional dampening springs are incorporated, offering increased strength and optimized spring rates tailored to the application, ensuring smooth engagement and quiet operation while maintaining high reliability. This clutch kit is balanced to within 0.25 oz-in, ensuring smooth operation across the entire RPM range, significantly better than the typical 0.50 oz-in balance of stock clutches. The pedal effort is expected to increase by 15-40% compared to stock, characteristic of a Heavy Duty application. For organic street discs, a break-in period of 300-500 miles with mild engagement is recommended before spirited driving or racing to ensure optimal performance and longevity. The ZM3-HDMM is recommended for both street and occasional race use, providing a blend of smooth engagement, quiet operation, and increased strength. This kit is specifically designed for various 2004-2013 Mazda 3 models with 2.0L and 2.3L engines, as well as 2006-2010 Mazda 5 models.