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

The Mod-Twin 225 XT Rigid Street Kit is engineered for high-powered AWD street vehicles, blending smooth, positive engagement with rapid shifting. It combines twice the organic friction surfaces with a solid Mono-Drive hub in a fully modular design. Each diaphragm spring undergoes a four-stage heat treatment for consistent light pedal feel. Steel-backed organic friction plates provide stable friction, excellent heat capacity, and long clutch life. Torque is uniformly transferred to a Mono-Drive chrome-moly hub, extending input shaft life with a single continuous spline. The lightweight, rigid design allows faster shifts and reliable operation. This kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, puck-style ceramic friction plates, rigid Mono-Drive hub, 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: 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 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 durability under demanding conditions
• Quality: Robust design, strategic features, premium materials, and close tolerances deliver high performance and 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