ACT Mod-Twin 225 Race Level 2 Rebuild Kit Subaru STI 2004-2021 | T2R-RK12

The ACT Mod-Twin 225 Race Level 2 Rebuild Kit (T2R-RK12) is a precision-engineered twin-disc clutch rebuild solution designed specifically for the 2004–2021 Subaru WRX STI. Built for high-performance and motorsport applications, this rebuild kit restores your ACT Mod-Twin system to race-ready condition, extending the life of your drivetrain investment without requiring a full clutch replacement. Ideal for track day enthusiasts, rally competitors, and serious performance drivers who demand consistent, reliable power transfer under extreme conditions.

Key Features & Benefits

• Race Level 2 Performance Rating – Engineered to handle aggressive power levels and high-RPM engagement common in modified and turbocharged WRX STI builds, providing confident power transfer on both street and track.
• Mod-Twin 225 Twin-Disc Architecture – Twin-disc design dramatically increases clamping force and torque capacity compared to single-disc setups, enabling reliable engagement even with significant power upgrades.
• OEM-Compatible Rebuild Solution – Designed to work specifically with ACT assemblies PN T2R-S05 and T2R-S07, ensuring a precise, drop-in fit with no modifications required to existing hardware.
• High-Quality ACT Friction Materials – ACT's proprietary friction disc compounds deliver smooth, consistent engagement characteristics while withstanding the heat and abuse of repeated high-performance use.
• Cost-Effective Restoration – Rebuilding with the T2R-RK12 kit extends the service life of your existing Mod-Twin system, offering a more economical alternative to full assembly replacement at race-level performance.
• Precision Manufactured Tolerances – Each component is manufactured to ACT's strict quality standards, ensuring proper clamp load, balance, and rotational integrity critical to twin-disc clutch systems.

What's Included

• ACT Mod-Twin 225 Race Level 2 Rebuild Kit components
• Friction disc(s) matched to Mod-Twin 225 specifications
• Pressure plate and/or wear components as applicable to rebuild specification
• Hardware and associated fasteners
• ACT product documentation and part reference guide

Note: This rebuild kit is intended for use wstiith ACT assemblies PN T2R-S05 and T2R-S07. Verify your existing assembly part numbers before ordering.

Specifications

Fitment & Compatibility

The ACT T2R-RK12 Mod-Twin 225 Race Level 2 Rebuild Kit is compatible with the following vehicles:

• 2004–2021 Subaru WRX STI – All trim levels with the EJ257 turbocharged boxer engine and 6-speed manual transmission (Subaru STI 6MT)

This kit is a rebuild component intended exclusively for use with ACT Mod-Twin assemblies PN T2R-S05 and PN T2R-S07. It is not a standalone clutch kit and requires an existing ACT Mod-Twin 225 assembly. Confirm your current ACT assembly part number before purchasing. If you are unsure of compatibility, consult your ACT documentation or contact a qualified drivetrain specialist.

Is this kit compatible with the base Subaru WRX (non-STI)? No. This kit is engineered for the Subaru WRX STI platform and its specific transmission and bell housing dimensions. It is not designed for the base WRX.

Is this CARB compliant? This is a race/performance drivetrain component intended for competition use. Users should verify local emissions and street legality regulations before installation on street-driven vehicles.

Installation

The ACT Mod-Twin 225 Race Level 2 Rebuild Kit requires removal of the transmission and disassembly of the existing ACT Mod-Twin clutch assembly (T2R-S05 or T2R-S07). Due to the precision nature of twin-disc clutch systems and the torque specifications involved, professional installation by an experienced performance drivetrain technician is strongly recommended. Proper alignment tools, a transmission jack, and torque wrenches are required. ACT recommends inspecting the flywheel surface, pilot bearing, throw-out bearing, and fork during any clutch rebuild service. Always follow ACT's published installation guidelines included with the kit.