Description
Upgrade your high-powered Subaru AWD street car with the ACT Mod-Twin 225 HD Sprung Street Clutch Kit, engineered to deliver high torque capacity without sacrificing pedal feel, engagement quality, or everyday drivability. The ACT T1SS-S01 Mod-Twin 225 HD Sprung Street Kit combines dual organic friction surfaces with an ultra-durable sprung Mono-Drive hub assembly to provide a strong, serviceable clutch solution for demanding street and street/strip applications.
With a 625 ft-lb torque capacity, this ACT Mod-Twin clutch provides approximately 99% more torque capacity than OE, making it well suited for modified and high-powered Subaru applications. The twin-disc design increases the available organic friction surface while maintaining a smooth, progressive engagement characteristic.
The kit uses steel-backed friction plates with high-quality organic friction material to provide a stable coefficient of friction, strong heat capacity, and long clutch life. Torque is transferred through the sprung Mono-Drive hub assembly, which helps reduce driveline shock caused by torsional vibration while extending input shaft life.
The ACT Mod-Twin is also fully rebuildable, allowing most individual components to be ordered separately when servicing or rebuilding the clutch.
Fitment
Subaru WRX — 2013–2014, 2.5L H4, 2458cc, DOHC
Subaru WRX — 2015–2021, 2.0L H4, 1998cc, DOHC
Subaru WRX — 2022–2026, 2.4L H4, 2387cc, DOHC
Subaru Legacy GT / GT Limited / GT spec.B — 2005–2011, 2.5L H4, 2458cc, DOHC Turbocharged
Subaru Outback XT / XT Limited — 2005–2010, 2.5L H4, 2458cc, DOHC Turbocharged
Subaru Baja Turbo — 2006, 2.5L H4, 2458cc, DOHC Turbocharged
Subaru Forester XT / XT Limited / Sports 2.5 XT — 2006–2008, 2.5L H4, 2458cc, DOHC Turbocharged
Subaru Impreza WRX — 2006–2014, 2.5L H4, 2458cc, DOHC
Subaru Impreza WRX Sti [JDM] — 2006–2007, 2.5L F4 FI, Turbocharged
Important: Verify your exact vehicle, transmission, engine configuration, and application before ordering. The supplied fitment data includes multiple Subaru platforms and engine generations, so compatibility should be confirmed against the specific vehicle.
Key Features
- ACT Mod-Twin 225 HD Sprung Street Clutch Kit
- Part Number: T1SS-S01
- 625 ft-lb torque capacity
- Approximately 99% greater torque capacity than OE
- 225 mm / 8.8-inch clutch diameter
- Twin-disc design
- Organic friction material
- Heavy Duty pressure plate
- Sprung Mono-Drive hub assembly
- Soft, progressive engagement
- Light pedal effort
- Smooth shifting characteristics
- High heat capacity
- Durable construction for demanding applications
- Designed for AWD street cars
- Recommended for Street and Street/Strip use
- Fully rebuildable modular design
- Most components available separately
- 100% clamp-load tested
- Dynamically balanced
- SFI 1.2 certified
Pedal Feel & Street Drivability
Despite its high torque capacity, the ACT Mod-Twin 225 HD Sprung Street Clutch Kit is designed to maintain a comfortable and predictable driving experience.
The clutch provides soft, progressive engagement with light pedal effort and smooth shifting, making it suitable for street-driven vehicles that require significantly more torque capacity than the factory clutch.
Depending on the vehicle and transmission, OE-to-mild transmission gear noise may be present.
Twin-Disc Design
The Mod-Twin design increases the available friction surface by combining two organic friction discs with a durable sprung hub assembly.
The steel-backed friction plates use high-quality organic friction material to provide consistent friction characteristics, heat capacity, and long-term durability. This allows the clutch to handle substantially greater torque while maintaining the progressive engagement expected from a street-oriented clutch.
Mono-Drive Sprung Hub
The ACT Mono-Drive sprung hub assembly transfers torque through the clutch while helping absorb torsional vibration.
This design helps reduce driveline shock and can help protect the transmission input shaft during high-load operation. The result is a more refined engagement compared with an unsprung high-performance clutch designed solely around maximum torque capacity.
Construction & Durability
The Mod-Twin uses a forged aluminum cover, Mono-Drive hub, specially treated diaphragm spring, premium friction materials, and hardened wear points to create a durable clutch package designed for demanding applications.
Each diaphragm spring undergoes ACT's exclusive four-stage heat-treatment process, helping provide consistent clamp load and light pedal effort throughout the clutch's operating life.
The clutch is also designed as a fully modular and rebuildable system, allowing individual components to be replaced or serviced rather than requiring complete clutch replacement.
What's Included
- CNC-machined and dynamically balanced flywheel
- Pressure plate cover
- Diaphragm spring
- Organic friction plates
- Puck-style ceramic friction plates
- Sprung Mono-Drive hub assembly
- Floater
- Patented Monoloc Collar
- Release bearing
- Alignment tool
- Pilot bearing, if required for the application
Specifications
| Specification | Details |
|---|---|
| Brand | ACT |
| Product | Mod-Twin 225 HD Sprung Street Clutch Kit |
| Part Number | T1SS-S01 |
| Product Weight | 27.4 lbs |
| Torque Capacity | 625 ft-lb |
| Torque Capacity Over OE | 99% |
| Disc Material | Organic |
| Clutch Disc Diameter | 8.8 in / 225 mm |
| Input Shaft Diameter | 1 in |
| Pressure Plate Type | Heavy Duty |
| Recommended Use | Street / Street-Strip |
| SFI Rating | 1.2 |
| Warranty | 12 Months |
| UPC | 00842385026592 |
Fitment Details
2005–2009 Subaru Legacy GT / GT Limited / GT spec.B — 2.5L H4, 2458cc, DOHC, Turbocharged
2005–2008 Subaru Outback XT / XT Limited — 2.5L H4, 2458cc, DOHC, Turbocharged
2006 Subaru Baja Turbo — 2.5L H4, 2458cc, DOHC, Turbocharged
2006–2008 Subaru Forester XT / XT Limited / Sports 2.5 XT — 2.5L H4, 2458cc, DOHC, Turbocharged
2006–2014 Subaru Impreza WRX / WRX Limited / WRX TR / WRX Premium — 2.5L H4, 2458cc, DOHC
2006–2007 Subaru Impreza WRX Sti [JDM] — 2.5L F4 FI, Turbocharged
2009–2014 Subaru Impreza WRX / WRX Premium / WRX Limited — 2.5L H4, 2458cc, DOHC
2009 Subaru Legacy GT Limited / GT spec.B — 2.5L H4, 2458cc, DOHC, Turbocharged
2009 Subaru Outback XT Limited — 2.5L H4, 2458cc, DOHC, Turbocharged
2010 Subaru Legacy 2.5GT — 2.5L H4, 2458cc, DOHC, Turbocharged
2010 Subaru Outback XT Limited — 2.5L H4, 2458cc, DOHC, Turbocharged
2011 Subaru Legacy 2.5GT — 2.5L H4, 2458cc, DOHC, Turbocharged
2013–2014 Subaru WRX Base / Limited / Premium — 2.5L H4, 2458cc, DOHC
2015–2021 Subaru WRX Base / Limited / Premium / Sport / Sport-tech / Sport-tech RS / 6 Man — 2.0L H4, 1998cc, DOHC
2022–2024 Subaru WRX Base / Limited / Premium / Sport / Sport-tech — 2.4L H4, 2387cc, DOHC
2025 Subaru WRX High / Limited / Premium / Sport / Sport-tech / TS — 2.4L H4, 2387cc, DOHC
2026 Subaru WRX High / Limited / Premium / Series.Yellow / Sport / Sport-tech / TS / tS Performance — 2.4L H4, 2387cc, DOHC
Important Fitment Disclaimer: The supplied application data spans several Subaru platforms and engine generations. Always verify the exact vehicle application and transmission configuration before purchasing.
Why Choose the ACT Mod-Twin 225?
The ACT Mod-Twin 225 HD Sprung Street Clutch Kit is designed for Subaru owners who need significantly more torque capacity than an OE clutch while still wanting a clutch that remains comfortable enough for street use.
Its combination of dual friction surfaces, organic friction material, sprung Mono-Drive hub technology, high-strength construction, high heat capacity, and rebuildable modular design makes it a strong solution for high-powered AWD street and street/strip applications.
