ACT HD-M/Race Sprung 4 Pad Clutch Kit - 2004-2021 Subaru STI

The ACT Heavy Duty Pressure Plate is an excellent combination of increased torque holding and pedal feel for most daily driven cars. The HD pressure plate provides 40% increase in clamp loading while creating only a moderate increase in pedal feel thanks to ACT's special, single diaphragm design.

ACT HD-M/Race Sprung 4 Pad Clutch Kit

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The SB10-HDG4 kit features ACT's most popular Heavy Duty pressure plate. ACT Heavy Duty 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 4-pad spring-centered race disc features a spring-center construction to properly damp torsional vibrations for quieter operation and resist failure even under harsh conditions. ACT spring retainers utilize wraparound spring windows and thicker retainer stampings to provide spring support, reduce stress concentrations, and increase strength and reliability.

With the 4-pad spring-centered race disc, engagement is harsher, but shifting is faster. ACT's 4-pad spring-centered race disc is well-suited for smaller disc sizes in smaller engines. 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:

• Light to moderate pedal effort, aggressive engagement, OE to mild gear rattle, confidence during hard shifts
• Moderate friction life, extended by ACT's exclusive diaphragm design, dramatic improvement in release mechanism life
• Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance, major improvement in release mechanism
• Recommended for high horsepower street or race use
• 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT's patented Monoloc
• Disc Type: Race Disc
• HD-M/Race Sprung 4 Pad

ACT Clutch kit includes: Heavy Duty Pressure Plate, Performance 4 Puck Racing Disk (Sprung), Release Bearing, and Alignment Tool. Torque Capacity: 659 Ft/lbs. Clamp Load Increase: 40%. Picture may vary from actual product.

About ACT Pressure Plate:The ACT Heavy Duty Pressure Plate is an excellent combination of increased torque holding and pedal feel for most daily driven cars. The HD pressure plate provides 40% increase in clamp loading while creating only a moderate increase in pedal feel thanks to ACT's special, single diaphragm design.

About ACT 4 Puck Sprung Disc:An ACT 4-Puck Sprung Hub Race Disc has very harsh engagement and is designed for road race cars only. A G4 friction surface has good durability and spline life characteristics under normal use. The sprung hub helps to reduce driveline shock and be relatively quiet compared to an unsprung hub but will definitely have chatter. The ACT G4 is SFI certified, so it is legal for all forms of racing that require SFI compliance. Not recommended for a daily driven/street car.