"Excellence in Performance", backed by the best one-year warranty in the industry! XT/Modified Street Moderate to heavy pedal effort, smooth positive engagement, OE to mild gear rattle; Longer clutch life achieved through ACT's exclusive diaphragm design; Precisely balanced and uses premium organic friction materials for heat tolerance, faster recovery from overheating and prevents warping of mating surfaces; Recommended for street and occasional race use; 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability SZ1-XTMM kit features an Xtreme pressure plate for the most demanding driver. ACT Xtreme pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT Modified spring-centered street discs feature premium organic friction material with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs are modified with reduced marcel for faster shift action to complement ACT pressure plates. The heavy duty torsional dampening springs are stronger, in most cases, than standard springs and are provided in the best sizes and spring rates to suit the application. Modified street discs allow for quicker shifting and engagement. Quiet operation with increased strength and reliability.