ACT Mod-Twin 225 HD Rigid Street Clutch Kit 2004-2021 STI

This is ACT's new Mod Twin 225 HD Rigid Race Clutch Kit. This particular clutch kit is ideal for high-horsepower AWD vehicles that experience aggressive launches and high-performance driving conditions. This clutch combines twice the ceramic friction surfaces with an ultra-durable mono-drive sprung hub assembly in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat-treating process that provides a consistent light-pedal feel. Other features include puck-style friction plates with high-quality ceramic friction materials that deliver a high friction coefficient, superior heat capacity, and longer clutch life. The friction plates uniformly transfer torque to a Mono-Drive sprung hub assembly which extends input shaft life and reduces driveline shock from torsional vibration. Feel: Predictable aggressive engagement, light pedal effort, quick shifting, possible start-off judder with mild to moderate transmission gear noise. Life: Forged Aluminum Cover, Mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure this long-life twin performs and survives under the most demanding conditions. Quality: Delivers maximum performance and high heat tolerance by combining robust design, strategic features, choice materials, and close tolerances. Recommended Use: Drag, Road, or Rally Racing. ACT Difference: Applying tactical engineering to the MOD-TWIN, ACT presents unique solutions to common tradeoffs found on twin disc clutches, resulting in an ultra-durable, customer serviceable, long-lasting clutch with very high torque capacity. All are 100% clamp load tested, balanced and SFI certified. HIGHLIGHTS Product Weight (lbs.) - 28.1 Torque Capacity (ft/lbs.) - 895 Torque Capacity Over OE - 152% Disc Material - Ceramic Clutch Disc Diameter (Inches) - 8.8 Clutch Disc Diameter (Millimeters) - 225 Input Shaft Diameter (inches) - 1 Pressure Plate Type - Heavy Duty The MOD Twin clutches are fully rebuildable and most components can be ordered separately. WHAT'S INCLUDED? CNC-machined and dynamically balanced flywheel Pressure plate cover Diaphragm spring Face Puck-style ceramic friction plates Sprung mono-drive hub assembly Floater Patented Monoloc Collar Release bearing Alignment tool Pilot bearing (if needed)