pressure plate uses exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All ACT diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's MaXX Xtreme pressure plates increase clamp load by 70 to 150 percent. MaXX Xtreme pressure plates are recommended for use with a race disc.