ACT Mod-Twin HD Sprung Race Kit Clutch Kit — Fits 04-20 Subaru WRX STI

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SKU: ACTT1R-S05
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Sale price$2,097.89 Regular price$2,598.00
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About ACT

ACT engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACT lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ACT Mod-Twin HD Sprung Race Kit: Extreme Performance for AWD Powerhouses

The ACT Mod-Twin HD Sprung Race Kit is engineered for the most demanding AWD performance vehicles, including the Subaru WRX STI. This kit is designed to handle aggressive launches and facilitate smoother shifting in high-horsepower applications by combining dual ceramic friction surfaces with an ultra-durable Mono-Drive sprung hub assembly. Its completely modular design ensures a perfect fit and exceptional performance.

Advanced Technology for Superior Control

Each diaphragm spring in this kit undergoes ACT's exclusive four-stage heat-treating process, ensuring a consistent and light pedal feel, even under extreme conditions. The puck-style friction plates utilize high-quality ceramic materials, providing a high friction coefficient, superior heat capacity, and extended clutch life. These plates efficiently transfer torque to the Mono-Drive sprung hub assembly, which is designed to protect the input shaft and reduce driveline shock caused by torsional vibrations. This kit boasts an impressive torque capacity of 895 ft-lbs.

Key Features and Benefits:

  • Dual ceramic friction surfaces for high torque capacity (895 ft-lbs).
  • Mono-Drive sprung hub assembly for input shaft protection.
  • Four-stage heat-treated diaphragm springs for consistent pedal feel.
  • High-quality ceramic friction materials for excellent grip and heat dissipation.
  • Modular design for precise fitment and performance.
  • Specifically designed for high-powered AWD vehicles like the Subaru WRX STI.
  • Not intended for street use.

This ACT Mod-Twin HD Sprung Race Kit is the ultimate solution for Subaru WRX STI owners seeking maximum performance and reliability on the track or in competition. Its robust construction and advanced features ensure it can withstand the rigors of high-performance driving. Upgrade your Subaru with this top-tier clutch kit from ACT, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2014 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2011-2014 Subaru Impreza WRX STI Limited
2015 Subaru WRX STI Launch Edition
2015-2021 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue
2018 Subaru WRX STI Type RA
2019 Subaru WRX STI S209

Product Details

Product Description
Part Numbers
Sizing & Fit

About ACT

ACT engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACT lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ACT Mod-Twin HD Sprung Race Kit: Extreme Performance for AWD Powerhouses

The ACT Mod-Twin HD Sprung Race Kit is engineered for the most demanding AWD performance vehicles, including the Subaru WRX STI. This kit is designed to handle aggressive launches and facilitate smoother shifting in high-horsepower applications by combining dual ceramic friction surfaces with an ultra-durable Mono-Drive sprung hub assembly. Its completely modular design ensures a perfect fit and exceptional performance.

Advanced Technology for Superior Control

Each diaphragm spring in this kit undergoes ACT's exclusive four-stage heat-treating process, ensuring a consistent and light pedal feel, even under extreme conditions. The puck-style friction plates utilize high-quality ceramic materials, providing a high friction coefficient, superior heat capacity, and extended clutch life. These plates efficiently transfer torque to the Mono-Drive sprung hub assembly, which is designed to protect the input shaft and reduce driveline shock caused by torsional vibrations. This kit boasts an impressive torque capacity of 895 ft-lbs.

Key Features and Benefits:

  • Dual ceramic friction surfaces for high torque capacity (895 ft-lbs).
  • Mono-Drive sprung hub assembly for input shaft protection.
  • Four-stage heat-treated diaphragm springs for consistent pedal feel.
  • High-quality ceramic friction materials for excellent grip and heat dissipation.
  • Modular design for precise fitment and performance.
  • Specifically designed for high-powered AWD vehicles like the Subaru WRX STI.
  • Not intended for street use.

This ACT Mod-Twin HD Sprung Race Kit is the ultimate solution for Subaru WRX STI owners seeking maximum performance and reliability on the track or in competition. Its robust construction and advanced features ensure it can withstand the rigors of high-performance driving. Upgrade your Subaru with this top-tier clutch kit from ACT, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2014 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2011-2014 Subaru Impreza WRX STI Limited
2015 Subaru WRX STI Launch Edition
2015-2021 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue
2018 Subaru WRX STI Type RA
2019 Subaru WRX STI S209

Product Details

Product Description

About ACT

ACT engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full ACT lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

ACT Mod-Twin HD Sprung Race Kit: Extreme Performance for AWD Powerhouses

The ACT Mod-Twin HD Sprung Race Kit is engineered for the most demanding AWD performance vehicles, including the Subaru WRX STI. This kit is designed to handle aggressive launches and facilitate smoother shifting in high-horsepower applications by combining dual ceramic friction surfaces with an ultra-durable Mono-Drive sprung hub assembly. Its completely modular design ensures a perfect fit and exceptional performance.

Advanced Technology for Superior Control

Each diaphragm spring in this kit undergoes ACT's exclusive four-stage heat-treating process, ensuring a consistent and light pedal feel, even under extreme conditions. The puck-style friction plates utilize high-quality ceramic materials, providing a high friction coefficient, superior heat capacity, and extended clutch life. These plates efficiently transfer torque to the Mono-Drive sprung hub assembly, which is designed to protect the input shaft and reduce driveline shock caused by torsional vibrations. This kit boasts an impressive torque capacity of 895 ft-lbs.

Key Features and Benefits:

  • Dual ceramic friction surfaces for high torque capacity (895 ft-lbs).
  • Mono-Drive sprung hub assembly for input shaft protection.
  • Four-stage heat-treated diaphragm springs for consistent pedal feel.
  • High-quality ceramic friction materials for excellent grip and heat dissipation.
  • Modular design for precise fitment and performance.
  • Specifically designed for high-powered AWD vehicles like the Subaru WRX STI.
  • Not intended for street use.

This ACT Mod-Twin HD Sprung Race Kit is the ultimate solution for Subaru WRX STI owners seeking maximum performance and reliability on the track or in competition. Its robust construction and advanced features ensure it can withstand the rigors of high-performance driving. Upgrade your Subaru with this top-tier clutch kit from ACT, available at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2004-2014 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2011-2014 Subaru Impreza WRX STI Limited
2015 Subaru WRX STI Launch Edition
2015-2021 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue
2018 Subaru WRX STI Type RA
2019 Subaru WRX STI S209

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