2004-2021 Subaru WRX STI ACT Xtreme Duty Performance Street Disc Clutch Kit SB10-XTSS 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\’s Performance street discs are the most popular disc purchased. They feature premium organic materials with higher copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. Quiet operation with increased strength and reliability. Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches. The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance. It provides uniform loading on the bearing and pressure plate to assure proper alignment, regardless of driver influence or vehicle modifications. Monoloc\’s hardened chrome-moly steel construction will provide years of service. Features Torque Capacity (ft/lbs.): 590 Moderate to heavy pedal effort, smooth positive engagement, OE to mild gear rattle, confidence during hard shifts Longer friction life, extended by ACT\’s exclusive diaphragm design, dramatic improvement in release mechanism life Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade, major improvement in release mechanism 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT\’s patented Monoloc Recommended for street and race use Benefits Increase clamp load, reduce deflection and maximize clutch life Better heat transfer and steel-backed lining for greater burst strength and durability Quiet operation with increased strength and reliability Applications 2004-2020Subaru WRX STI 2007-2009 Subaru Legacy GT spec.B*6 speed applications only – Must use ACT or factory flywheel for the 2004 and newer WRX STi What\’s in the box? 3000503 – Perf Street Sprung Disc AT90 – Alignment Tool PB1004 – Pilot Bearing RB601 – Release Bearing SB019X – P/PL-M Xtreme Pressure Plate ACT\’s patented Monoloc Installation Instructions!