ACT Mod-Twin 225 Extreme Duty Sprung Street Twin Disk Clutch Kit 2004-2021 STI

The Mod-Twin 225 XT Sprung Street Kit is engineered for high-powered AWD street cars, delivering a perfect balance of pedal feel, engagement quality, and torque capacity. It features twice the organic friction surfaces combined with an ultra-durable spring-center Mono-Drive hub in a fully modular design. Each diaphragm spring undergoes an exclusive four-stage heat-treating process to ensure consistent light pedal effort. Steel-backed organic friction plates provide stable friction, excellent heat capacity, and long clutch life. Torque is evenly transferred to the Mono-Drive sprung hub assembly, extending input shaft life and reducing driveline shock from torsional vibration. The kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, puck-style ceramic friction plates, sprung Mono-Drive hub assembly, floater, patented Monoloc collar, release bearing, alignment tool, and pilot bearing (if required). Mod-Twin clutches are fully rebuildable, with most components available separately.

Specifications:

• Torque Capacity: 875 ft/lbs (146% over OE)
• Disc Material: Organic
• Disc Diameter: 8.8 in / 225 mm
• Input Shaft Diameter: 1 in
• Pressure Plate Type: Xtreme
• Product Weight: 28.1 lbs
• SFI Certified: 1.2

Performance Features:

• Feel: Soft progressive engagement, light pedal effort, smooth shifting with OE to mild transmission gear noise
• Life: Forged aluminum cover, Mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure durability under demanding conditions
• Quality: Engineered for maximum performance and heat tolerance with robust design, premium materials, and precise tolerances
• Recommended Use: Street or Street/Strip
• ACT Difference: Ultra-durable, customer-serviceable, long-lasting twin disc clutch with very high torque capacity. 100% clamp load tested, balanced, and SFI certified