The ACT T1R-S05 Mod-Twin 225 HD Sprung Race Kit is engineered for high-performance applications, delivering aggressive launches and smoother shifts in high-powered AWD vehicles like the Subaru WRX STI. Built with twice the ceramic friction surfaces and a durable Mono-Drive sprung hub assembly, this clutch kit ensures reliable power transfer and long-lasting performance under demanding racing conditions. Each diaphragm spring undergoes a four-stage heat treatment process, providing a consistent light pedal feel that enhances driver control during intense driving sessions. The high-quality ceramic friction plates feature a superior coefficient of friction and heat capacity, enabling the clutch to endure high temperatures while maintaining excellent durability and long service life. These friction plates distribute torque uniformly to the Mono-Drive hub, reducing driveline shock and extending input shaft life, which is critical for sustained high-performance use. The kit includes a CNC-machined and dynamically balanced flywheel, pressure plate cover, diaphragm spring, face, puck-style ceramic friction plates, sprung Mono-Drive hub assembly, floater, patented Monoloc Collar, release bearing, alignment tool, and pilot bearing if needed. Designed for rebuildability, most components are available separately, allowing for easy maintenance and upgrades. The Mod-Twin 225 HD offers predictable, aggressive engagement with a light pedal effort and quick shifting characteristics, making it suitable for drag racing, road racing, or rally applications. Its forged aluminum cover, Mono-Drive hub, and premium friction materials ensure optimal heat tolerance and long-term durability. ACT’s engineering solutions effectively address common twin disc clutch tradeoffs, resulting in a high-torque capacity, customer-serviceable clutch that withstands the rigors of competitive motorsport. Each clutch is 100% clamp load tested, balanced, and SFI certified, backed by the industry’s best one-year warranty for peace of mind and performance reliability.
Features:
- Aggressive launch capability with smooth shifting for high-powered AWDs
- Dual ceramic friction surfaces for high heat tolerance and durability
- Mono-Drive sprung hub assembly to reduce driveline shock and extend input shaft life
- Four-stage heat-treated diaphragm spring for consistent pedal feel
- Includes CNC-machined, balanced flywheel and all essential components for installation
- Fully rebuildable design with most parts available separately for maintenance
- Engineered for drag, road, or rally racing with high torque capacity
- ACT's quality assurance with clamp load testing and SFI certification
- Backed by a one-year industry-leading warranty
Fitment:
2004 Subaru Impreza WRX STI
2005 Subaru Impreza WRX STI
2006 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI
2007 Subaru Impreza WRX STI Limited
2008 Subaru Impreza WRX STI
2009 Subaru Impreza WRX STI
2010 Subaru Impreza WRX STI
2010 Subaru Impreza WRX STI Special Edition
2011 Subaru Impreza WRX STI
2011 Subaru Impreza WRX STI Limited
2012 Subaru Impreza WRX STI
2012 Subaru Impreza WRX STI Limited
2013 Subaru Impreza WRX STI
2013 Subaru Impreza WRX STI Limited
2014 Subaru Impreza WRX STI
2014 Subaru Impreza WRX STI Limited
2015 Subaru WRX STI Base
2015 Subaru WRX STI Launch Edition
2015 Subaru WRX STI Limited
2016 Subaru WRX STI Base
2016 Subaru WRX STI Limited
2016 Subaru WRX STI Series.HyperBlue
2017 Subaru WRX STI Base
2017 Subaru WRX STI Limited
2018 Subaru WRX STI Base
2018 Subaru WRX STI Limited
2018 Subaru WRX STI Type RA
2019 Subaru WRX STI Base
2019 Subaru WRX STI Limited
2019 Subaru WRX STI S209
2020 Subaru WRX STI Base
2020 Subaru WRX STI Limited
2021 Subaru WRX STI Base
2021 Subaru WRX STI Limited
