ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disc Clutch Kit 2004-2021 STI

The Mod-Twin 225 HD Sprung Street Kit is engineered for high-powered AWD street cars, delivering uncompromised pedal feel, durability, and engagement quality with very high torque capacity. This modular twin-disc setup combines twice the organic friction surfaces with an ultra-durable spring-center Mono-Drive hub. Each diaphragm spring undergoes an exclusive four-stage heat treatment for consistent light pedal feel. Steel-backed organic friction plates provide stable friction, good heat capacity, and long clutch life. Torque is evenly transferred through the Mono-Drive sprung hub assembly, which extends input shaft life and reduces driveline shock from torsional vibration. The kit includes a CNC-machined, 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 needed). Mod-Twin clutches are fully rebuildable, with most components available separately.

Specs

• Torque Capacity: 700 ft/lbs (97% over OE)
• Disc Material: Organic
• Disc Diameter: 8.8 in / 225 mm
• Input Shaft Diameter: 1 in
• Pressure Plate Type: Heavy Duty
• Product Weight: 28.1 lbs
• SFI: 1.2

Performance Characteristics

• 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 long-life performance under demanding conditions
• Quality: Combines robust design, strategic features, premium materials, and close tolerances for maximum performance and high heat tolerance
• Recommended Use: Street or Street/Strip
• ACT Difference: Ultra-durable, customer-serviceable twin disc clutch, 100% clamp load tested, dynamically balanced, and SFI certified