Description
ACT Clutch Kit – 2004-2021 Subaru Impreza WRX/STI
ACT clutch kits combine an application-specific pressure plate and matched disc. Choose by torque requirement, engagement preference, street/track use, and tolerance for drivetrain noise.
Which option should I choose?
The table below uses the rating/specification supplied for each exact ACT SKU where available. We do not copy a torque rating from a different vehicle application.
| Configuration | Application-Specific Ratings & Specs | Driver Guidance |
|---|---|---|
|
Standard Configuration ACTT1R-S05 |
Torque capacity: 895 ft-lb • Capacity over OE: 152% • Disc material: Ceramic • Disc diameter: 8.8 in / 225 mm • Input shaft: 1 • Pressure plate: Heavy Duty • Feel: Predictable aggressive engagement, light pedal effort, quick shifting, possible start-off judder with OE to mild transmission gear noise • Recommended use: Drag, Road, or Rally Racing | Sprung hub adds driveline damping and street tolerance. |
Configuration Details
Standard Configuration (ACTT1R-S05)
Specifications Item Description ACT Mod-Twin 225 Heavy Duty Sprung Race Clutch Kit 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 Warranty 12 Months ( view details ) SFI 1.2 Description T1R-S05 Mod-Twin 225 HD Sprung Race Kit performs aggressive launches and smoother shifting in high powered AWD’s by combining 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 providing a consistent light pedal feel. Puck-style Friction Plates with high quality ceramic friction materials deliver high friction coefficient, superior heat capacity, and long clutch life. These Friction Plates uniformly transfer torque to a Mono-Drive sprung hub assembly which extend
Fitment note: Confirm model year, engine, transmission, flywheel, and related clutch components before ordering.