Stage 2 Clutch Kit (1KS) for Subaru WRX STI 2004-2021 2.5L DOHC (EJ257) Turbo AWD

Stage 2 Clutch Kit (1KS) for Subaru WRX STI 2004-2021 2.5L DOHC (EJ257) Turbo AWD Includes ACT Monoloc



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Action Clutch’s Stage 2 (1KS) clutch kit is the ideal choice for peak performance and long-term durability. The kit uses a reinforced Steel-Backed segmented Kevlar® friction material, giving you superior strength that withstands day to day wear and tear. This kit features a single diaphragm heavy-duty pressure plate that provides an OEM-like pedal feel with smooth engagement after proper break in. In addition, the Kevlar® material offers great advantages like extended lifespan, buttery smooth engagement and heat dissipation. Whether you have a basic bolt-on setup or more extensive engine modifications such as cams, this kit will get the job done. This clutch kit is not recommended for drag racing or drifting.

At Action Clutch, safety is our top priority. We understand how catastrophic engine or transmission damage can be caused by springs popping out which is why we use our patented, fully enclosed spring retainers to keep your investment protected at all times. Every kit is quality checked by one of our experienced engineers (with over 60 years of collective experience) and signed off as safe before being released as a finished product. This gives you peace of mind knowing that your Action Clutch will perform consistently every time.




Product Type Stage 2 Clutch Kit (1KS)
Product Weight (lbs)
SFI 1.1
What’s Included
  • Sprung Segmented Kevlar Disc
  • Single Diaphragm HD Pressure Plate
  • Pilot Bearing / Bushing (when applicable)
  • Clutch Alignment Tool
  • Conventional Release Bearing

Break-in Requirements
1,000 street miles / Keep RPM’s under 4500, no more than half-throttle, no boost (if applicable).
Proper break-in is required in order to retain product warranty, ensure longevity and holding capacity.

*Increase in holding capacity is rated in Crank Torque, not Wheel Torque

SFI Spec 1.1 Replacement Flywheels and Clutch Assemblies

California Residents: Prop 65 WARNING: This product MAY contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling. For more information, visit


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