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

This is ACT's new Mod Twin 225 HD Sprung Street Clutch Kit is ideal for high-horsepower AWD vehicles and unites uncompromised pedal feel, durability, and engagement quality with high-torque capacity. This clutch combines twice the organic friction surfaces with an ultra-durable spring-center mono-drive 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 steel-backed friction plates with high-quality organic friction materials that deliver stable 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.  PERFORMANCE: Torque capacity: 700 ft/lbs Torque capacity over OE: 97% Sprung street-disc type Organic disc material Recommended use: Street or Street/Strip FEEL: Soft progressive engagement Light pedal effort Smooth shifting Possible start-off judder with OE to mild transmission gear noise CONSTRUCTION: Forged aluminum cover Mono-drive hub Exclusive diaphragm Premium friction materials with hardened wear points  QUALITY: Delivers maximum performance Delivers high-heat tolerances by combining robust design, strategic features, choice materials, and close tolerances INCLUDES: 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) NOTE: The MOD Twin clutches are fully rebuildable and most components can be ordered separately