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ACT Subaru 2004-2020 WRX STI Mod Twin HD Street Kit Sprung Mono-Drive Hub Torque Capacity 700ft/lbs

SKU: ACT-T1S-S05
ACT 2004-2020 Subaru WRX STI Mod Twin HD Street Sprung Clutch Kit – 700 ft/lbs Torque Capacity Dominate the street or strip with the ACT Mod Twin Disc HD Clutch Kit for Subaru WRX STI. With a 700 ft/lb torque rating, this race-inspired clutch uses a mono-drive hub design and sprung discs for exceptional shock absorption and street-friendly engagement.
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ACT Mod-Twin HD Street Clutch Kit – 2004-2020 Subaru WRX STI (Sprung Mono-Drive Hub)

Designed for high-powered AWD street machines, the ACT Mod-Twin 225 Heavy Duty Sprung Street Clutch Kit (T1S-S05) delivers massive torque capacity without sacrificing drivability. With its modular twin-disc design and advanced Mono-Drive sprung hub, this clutch provides smooth engagement, a light pedal feel, and the durability needed to handle serious power on the street or strip.

Key Features & Benefits

  • Massive Torque Holding: Rated up to 700 ft-lbs of torque—an impressive 97% increase over stock capacity.
  • Sprung Mono-Drive Hub Design: Minimizes driveline shock and torsional vibration while extending input shaft life.
  • Dual Organic Friction Discs: Premium, high-copper organic material ensures stable friction, excellent heat tolerance, and long-lasting performance.
  • Consistent Pedal Feel: Diaphragm springs undergo a 4-stage heat treatment process for reliable, light pedal effort under extreme conditions.
  • Fully Modular & Rebuildable: Components can be replaced individually, offering long-term value and easy serviceability.

Technical Specifications

Clutch Disc Diameter:8.8" / 225 mm
Input Shaft Diameter:1.0"
Torque Capacity:700 ft-lbs
Torque Gain Over OE:+97%
Product Weight:28.1 lbs
Pressure Plate Type:Heavy Duty
SFI Certification:1.2
Warranty:12 Months

What to Expect

  • Feel: Light pedal effort with soft, progressive engagement and smooth shifting. Expect OE to mild gear noise under load.
  • Longevity: Built for long-term durability with forged aluminum components, hardened wear points, and premium materials throughout.
  • Build Quality: Each kit is precision-engineered, computer-balanced, and built to withstand high heat and demanding use.

The ACT Difference

The ACT Mod-Twin goes beyond conventional twin-disc designs. By strategically engineering around common compromises, ACT delivers a high-performance clutch that's not only incredibly strong but also streetable and serviceable. Every unit is 100% clamp load tested, dynamically balanced, and SFI certified for trusted performance.