Description
ACT Mod-Twin 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 ACTT1S-S07 |
Torque capacity: 700 ft-lb • Capacity over OE: 97% • Disc material: Organic • Disc diameter: 8.8 in / 225 mm • Input shaft: 1 • Pressure plate: Heavy Duty • Feel: Soft progressive engagement, light pedal effort, smooth shifting, with mild to moderate transmission gear noise • Recommended use: Street or Street/Strip | Smoothest engagement; preferred for primarily street-driven vehicles. Rigid hub gives direct response with greater drivetrain shock/noise. |
Configuration Details
Standard Configuration (ACTT1S-S07)
Specifications Item Description ACT Mod-Twin 225 Heavy Duty Rigid Street Clutch Kit Product Weight (lbs.) 28.1 Torque Capacity (ft/lbs.) 700  Torque Capacity Over OE 97% Disc Material Organic 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 T1S-S07 Mod-Twin 225 HD Rigid Street Kit blends easy pedal feel, smooth but positive engagement with quick shifting for high powered AWD’s by combining twice the organic friction surfaces with a no-nonsense rigid Mono-Drive hub in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat treating process. Steel-backed Friction Plates with high quality organic friction materials deliver stable friction coefficient, good heat capacity and long clutch life. These Friction Plates uniformly transfer torque to a Mono-Drive chrome-moly hub which is heat treated for strength and durab
Fitment note: Confirm model year, engine, transmission, flywheel, and related clutch components before ordering.