ACT Mod Twin 225 Heavy Duty Rigid Street Twin Disk Clutch Kit (T1S-S07) | Subaru STI 2004-2021

The ACT Mod Twin 225 Heavy Duty Rigid Street Twin Disk Clutch Kit (T1S‑S07) is engineered for 2004–2021 Subaru STI owners seeking rugged, high‑capacity clutch performance with precise, positive engagement for spirited street driving and performance builds. Featuring dual 225 mm friction discs and a rigid center design for direct torque transfer, this twin clutch system delivers consistent power handling, reduced deflection under load, and improved throttle response ideal for high‑output and tuned engines where durability and control are paramount.

KEY FEATURES

• Dual 225 mm friction discs provide extensive surface area for increased torque capacity and grip
• Rigid center disc design delivers direct, positive engagement with minimal deflection
• Includes heavy‑duty pressure plate engineered for high clamp load and heat tolerance
• Complete kit includes both friction discs, pressure plate, release bearing, pilot bearing, and alignment tool for direct‑fit installation
• Optimized for high‑power street use and aggressive performance builds requiring solid engagement
• Direct‑fit design compatible with OEM crankshaft and clutch mounting points for straightforward installation

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2004–2021
• Clutch Type: Mod Twin 225 Heavy Duty Rigid Street Twin Disk Clutch Kit
• Included Components: Twin friction discs, heavy‑duty pressure plate, release bearing, pilot bearing, alignment tool
• Torque Capacity: ~640 lb‑ft (verified for T1S‑S07 configuration)
• Horsepower Support: Up to ~690 HP (approximate based on verified torque capacity)
• Disc Diameter: Dual 225 mm friction discs for maximum holding power
• Material: High‑performance friction material with heat‑treated pressure plate for durability under heavy load
• Installation: Direct‑fit replacement using OEM crankshaft and clutch bolt patterns
• Performance Benefit: Direct, positive engagement with high torque handling and reduced deflection for consistent operation under street and performance conditions

VEHICLE FITMENT

• Subaru STI 2004–2021

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