ACT Heavy Duty Performance Street Disc Clutch 2004-2021 STI / 2007-2009 Legacy GT Spec B

The SB10-HDSS kit pairs ACT’s Heavy Duty pressure plate with their Performance Street disc for reliable street and light race performance. The diaphragm-style pressure plate increases clamp load, reduces deflection, and maximizes clutch life. The premium organic disc with high copper content and steel-backed lining provides superior heat transfer, durability, and burst strength. Reduced marcel design allows quicker shifts, while the Monoloc one-piece collar ensures proper alignment and improves release mechanism life. Quiet operation, increased reliability, and long-lasting performance make this kit ideal for high-performance street use.

Specs

• Torque Capacity: 522 ft/lbs (45% over OE)
• Disc Material: Organic
• Disc Diameter: 9.4 in / 240 mm
• Input Shaft Diameter: 1 in
• Pressure Plate Type: Heavy Duty
• Product Weight: 18.2 lbs

Performance Characteristics

• Feel: Light to moderate pedal effort, smooth positive engagement, OE to mild gear rattle, confident during hard shifts
• Life: Extended friction life with significant improvement to release mechanism longevity
• Quality: Precisely assembled, balanced, with premium organic friction materials for heat tolerance and reduced fade
• Recommended Use: Street and race use
• ACT Difference: 100% clamp load tested, dynamically balanced, includes ACT’s patented Monoloc