ACT Heavy Duty Sprung 4 Puck Disc Clutch Kit (SB10-HDG4) | Subaru STI 2004-2021

The ACT Heavy Duty Sprung 4 Puck Disc Clutch Kit (SB10‑HDG4) is engineered for 2004–2021 Subaru STI owners seeking a high‑performance clutch that balances track‑capable endurance and smooth engagement. Featuring a sprung 4‑puck design with high‑performance friction material and a heavy‑duty pressure plate, this clutch delivers strong torque capacity, reduced drivetrain shock, and confident engagement ideal for spirited driving, autocross, drag, and track day use without sacrificing manageable pedal feel.

KEY FEATURES

• Sprung 4‑puck clutch disc engineered for aggressive engagement with reduced chatter and driveline shock
• Heavy duty pressure plate increases clamp load and improves torque handling for high‑output applications
• Durable performance friction material designed for heat resistance, longevity, and consistent engagement
• Includes clutch disc, pressure plate, and release bearing for a complete, direct‑fit replacement
• Optimized for street performance and light‑to‑moderate track use
• Direct‑fit design compatible with OEM crankshaft and clutch mounting hardware

TECHNICAL SPECIFICATIONS

• Platform Compatibility: Subaru STI 2004–2021
• Clutch Type: Heavy Duty Sprung 4 Puck Disc Clutch Kit
• Included Components: Sprung 4‑puck clutch disc, heavy duty pressure plate, release bearing
• Torque Capacity: ~600 lb‑ft (verified for SB10‑HDG4 configuration)
• Horsepower Support: Up to ~650 HP (approximate based on verified torque capacity)
• Material: High‑performance friction disc with heat‑treated pressure plate for durability under load
• Installation: Direct‑fit replacement using OEM crankshaft and clutch bolt patterns
• Performance Benefit: Smooth yet aggressive engagement, improved torque handling, and consistent performance across a wide power range

VEHICLE FITMENT

• Subaru STI 2004–2021

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