ACT Extreme Performance Street Sprung Clutch 2004-2021 STI / 2007-2009 Legacy GT Spec B

The SB10-XTSS ACT Extreme Performance Street Sprung Clutch Kit is designed for high-powered street cars seeking smooth, reliable engagement with enhanced durability. It features an Xtreme pressure plate with an exclusive diaphragm design that increases clamp load, reduces deflection, and maximizes clutch life. The premium organic street disc offers higher copper content for improved heat transfer and steel-backed construction for increased burst strength and durability. Reduced marcel design ensures quicker shift action, complementing the pressure plate. The kit also includes ACT’s patented Monoloc—a one-piece, hardened chrome-moly steel collar that maintains consistent bearing and pressure plate alignment for long-lasting reliability.

Specs

• Torque Capacity: 598 ft/lbs (68% over OE)
• Disc Material: Organic
• Clutch Disc Diameter: 9.4 in / 240 mm
• Input Shaft Diameter: 1 in
• Pressure Plate Type: Xtreme
• Product Weight: 18.2 lbs

Performance Characteristics

• Feel: Moderate to heavy pedal effort, smooth positive engagement, OE to mild gear rattle, confidence during hard shifts
• Life: Extended friction life through ACT’s diaphragm design, significant improvement in release mechanism durability
• Quality: Precisely engineered and balanced, with premium organic friction materials for heat tolerance and reduced fade
• Recommended Use: Street and race use
• ACT Difference: 100% clamp load tested and dynamically balanced for smooth high RPM reliability; includes ACT’s patented Monoloc