ACT 04-20 WRX STI Mod-Twin HD Sprung Mono-Drive Race Kit

ACT 04-20 WRX STI Mod-Twin HD Sprung Race Kit for High Powered AWD with Ceramic Friction Purpose-built for 04-20 WRX STI applications , the ACT Mod-Twin 225 HD delivers aggressive launches and smoother shifts by combining dual ceramic friction surfaces with a rugged Mono-Drive sprung hub in a modular, serviceable design. Key Features Dual ceramic puck-style friction plates — high friction coefficient, superior heat capacity, and extended clutch life for repeatable track performance. Mono-Drive sprung hub assembly — reduces driveline shock and torsional vibration, lengthening input shaft life and improving drivability. Four-stage heat-treated diaphragm spring — consistent, light pedal feel for precise engagement and control. Complete modular kit — includes CNC-machined dynamically balanced flywheel, pressure plate cover, diaphragm spring, face, puck-style ceramic plates, sprung hub, floater, patented Monoloc Collar, release bearing, alignment tool and pilot bearing (if required). Rebuildable design — most components are replaceable to extend service life and reduce long-term cost. Benefits Optimized for high torque 04-20 WRX STI setups—consistent launch and shift performance under heavy loads. Improved thermal management and wear resistance thanks to ceramic friction materials. Reduced driveline shock for smoother operation and component longevity. Easy maintenance with modular, serviceable components and available replacement parts. Ideal for racers and performance enthusiasts seeking a durable, high-performance clutch solution for 04-20 WRX STI applications. Not for street use.