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

by ACT
Save 22% Save 22%
Original price $2,021.00
Original price $2,021.00 - Original price $2,021.00
Original price $2,021.00
Current price $1,576.00
$1,576.00 - $1,576.00
Current price $1,576.00
  Lease to own   Pay as low as   $/week

Availability : 1 In stock

This is ACT's new Mod Twin 225 HD Rigid Race Clutch Kit. This particular clutch kit is ideal for high-horsepower AWD vehicles that experience aggressive launches and high-performance driving conditions. This clutch combines twice the ceramic friction surfaces with an ultra-durable mono-drive sprung 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 puck-style friction plates with high-quality ceramic friction materials that deliver a high 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.

Feel: Predictable aggressive engagement, light pedal effort, quick shifting, possible start-off judder with mild to moderate transmission gear noise.

Life: Forged Aluminum Cover, Mono-drive hub, exclusive diaphragm, premium friction materials, and hardened wear points ensure this long-life twin performs and survives under the most demanding conditions.

Quality: Delivers maximum performance and high heat tolerance by combining robust design, strategic features, choice materials, and close tolerances.

Recommended Use: Drag, Road, or Rally Racing.

ACT Difference: Applying tactical engineering to the MOD-TWIN, ACT presents unique solutions to common tradeoffs found on twin disc clutches, resulting in an ultra-durable, customer serviceable, long-lasting clutch with very high torque capacity. All are 100% clamp load tested, balanced and SFI certified.


  • Product Weight (lbs.) - 28.1
  • Torque Capacity (ft/lbs.) - 895
  • Torque Capacity Over OE - 152%
  • Disc Material - Ceramic
  • Clutch Disc Diameter (Inches) - 8.8
  • Clutch Disc Diameter (Millimeters) - 225
  • Input Shaft Diameter (inches) - 1
  • Pressure Plate Type - Heavy Duty
  • The MOD Twin clutches are fully rebuildable and most components can be ordered separately.


  • 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)