ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit (T1S-S05) | Subaru STI 2004-2021

The ACT Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit (T1S‑S05) is engineered for 2004–2021 Subaru STI owners seeking enhanced torque capacity, smooth engagement, and increased surface area for improved durability in street and performance driving. Featuring dual 225 mm friction discs with sprung center design, this street twin clutch balances aggressive performance with refined drivability ideal for high‑output engines, spirited backroad driving, and daily use where both smooth engagement and strong torque management matter.

KEY FEATURES

• Dual 225 mm friction discs increase surface area for higher torque capacity and longer wear life compared to single‑disc setups
• Sprung center disc design reduces driveline shock, chatter, and vibration for smoother, more controlled engagement
• Includes heavy duty pressure plate engineered for consistent clamp load and exceptional durability
• Complete kit includes twin disc assembly, pressure plate, release bearing, pilot bearing, and alignment tool for direct‑fit installation
• Optimized for street and performance driving excellent choice for heavier vehicles, turbo upgrades, or vehicles making significant power increases
• Direct‑fit design compatible with OEM crankshaft and clutch mounting locations for straightforward installation

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2004–2021
• Clutch Type: Mod Twin 225 Heavy Duty Sprung Street Twin Disk Clutch Kit
• Included Components: Twin friction discs, heavy duty pressure plate, release bearing, pilot bearing, alignment tool
• Torque Capacity: ~620 lb‑ft (verified for T1S‑S05 configuration)
• Horsepower Support: Up to ~680 HP (approximate based on verified torque capacity)
• Disc Diameter: Dual 225 mm friction discs for increased holding power and durability
• Material: High‑performance friction material, heat‑treated pressure plate for extended life under load
• Installation: Direct‑fit replacement using OEM crankshaft and clutch bolt patterns
• Performance Benefit: Enhanced torque handling, smooth engagement, increased surface area for extended durability, and refined street drivability

VEHICLE FITMENT

• Subaru STI 2004–2021

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