ACT Mod Twin 225 Heavy Duty Sprung Race Twin Disk Clutch Kit (T1R-S05) | Subaru STI 2004-2021

The ACT Mod Twin 225 Heavy Duty Sprung Race Twin Disk Clutch Kit (T1R‑S05) is engineered for 2004–2021 Subaru STI owners seeking a premium, heavy‑duty twin‑disc clutch system capable of handling high torque and aggressive driving demands. Featuring dual 225 mm friction surfaces and a sprung center plate for reduced noise and vibration, this twin disk setup delivers smooth engagement with exceptional torque capacity, making it ideal for high‑power street builds, drag, road race, and high‑boost applications.

KEY FEATURES

• Dual 225 mm friction discs provide increased surface area for maximum torque handling and grip
• Sprung center disc design reduces driveline shock, chatter, and vibration for smoother engagement than typical rigid twin setups
• Includes premium performance pressure plate engineered for high clamp load and heat resistance
• Complete kit includes pressure plate, twin disc assembly, release bearing, pilot bearing, and alignment tool for direct‑fit installation
• Optimized for high‑power street use, drag racing, and road race applications where strong, consistent engagement is required
• Direct‑fit design compatible with factory crankshaft and clutch bolt patterns

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2004–2021
• Clutch Type: Mod Twin 225 Heavy Duty Sprung Race Twin Disk Clutch Kit
• Included Components: Twin clutch discs, heavy duty pressure plate, release bearing, pilot bearing, alignment tool
• Torque Capacity: ~650 lb‑ft (verified ACT rating for T1R‑S05 configuration)
• Horsepower Support: Up to ~700 HP (approximate based on verified torque capacity and real‑world performance correlation)
• Disc Diameter: Dual 225 mm friction discs for increased holding power
• Material: High‑performance friction material and heat‑treated pressure plate for durability under extreme load
• Installation: Direct‑fit replacement using OEM crankshaft and clutch mounting points
• Performance Benefit: Exceptional torque handling, smooth engagement, increased surface area for sustained high‑power operation

VEHICLE FITMENT

• Subaru STI 2004–2021

ACT delivers proven, data‑driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.