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

The Mod-Twin 225 HD Rigid Street Kit is designed for high-powered AWD vehicles, blending easy pedal feel with smooth yet positive engagement and quick shifting. This modular twin-disc design combines twice the organic friction surfaces with a rigid Mono-Drive hub for durability. Each diaphragm spring undergoes a four-stage heat treatment. Steel-backed friction plates with premium organic materials provide stable friction, good heat capacity, and long life. Torque is evenly transferred through the chrome-moly Mono-Drive hub, heat treated for strength and extended input shaft life. The lightweight, rigid design ensures faster shifts and trouble-free service. Kit includes CNC-machined, dynamically balanced flywheel, pressure plate, diaphragm spring, friction plates, rigid Mono-Drive hub, floater, Monoloc collar, release bearing, alignment tool, and pilot bearing (if required). 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, mild to moderate transmission gear noise
• Life: Forged aluminum cover, Mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure long-lasting performance under demanding conditions
• Quality: Maximum performance and high heat tolerance through robust design, strategic features, select materials, and precise tolerances
• Recommended Use: Street or Street/Strip
• ACT Difference: Ultra-durable, customer-serviceable twin disc clutch, 100% clamp load tested, dynamically balanced, and SFI certified