The ACT Subaru 04-20 WRX STI Mod-Twin 225 HD Sprung Street Clutch Kit is engineered for high-powered all-wheel-drive street applications. Designed to deliver a balance of smooth engagement, durability, and high torque capacity, this clutch kit features dual organic friction surfaces combined with an ultra-durable spring-centered Mono-Drive hub, ensuring reliable performance under demanding conditions. Each diaphragm spring undergoes a meticulous four-stage heat treatment process that provides a consistent, light pedal effort while maintaining high heat resistance. The steel-backed friction plates utilize high-quality organic friction materials that offer stable coefficient of friction, excellent heat capacity, and extended clutch life, all contributing to a smooth, predictable clutch engagement. The friction plates evenly transfer torque to the sprung Mono-Drive hub assembly, which helps extend input shaft life and reduces driveline shock caused by torsional vibrations. 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. All components are fully rebuildable, with most parts available for individual order, ensuring ease of maintenance and customization. The Mod-Twin HD Street clutch offers a soft, progressive engagement with light pedal effort, resulting in smooth shifting with minimal transmission noise typical of OE to mild setups. Constructed with forged aluminum cover, premium friction materials, and hardened wear points, this clutch is built to last and perform under intense street or street/strip conditions. ACT’s innovative engineering addresses common twin disc tradeoffs, providing an ultra-durable, customer-serviceable clutch capable of handling up to 700 ft-lbs of torque. Each clutch is 100% clamp load tested, balanced, and SFI certified, backed by ACT's industry-leading one-year warranty, making it a reliable choice for enthusiasts seeking maximum performance and longevity in their Subaru WRX STI.
Features:
- High torque capacity: Supports up to 700 ft-lbs for demanding street and mild strip use
- Four-stage heat treatment process: Ensures consistent, light pedal effort and durability
- Dual organic friction surfaces: Provide stable friction coefficient, heat capacity, and long clutch life
- Sprung Mono-Drive hub: Reduces driveline shock and extends input shaft life
- Complete kit includes: CNC-machined flywheel, pressure plate, ceramic friction plates, release bearing, and more
- Fully rebuildable: Most components are available separately for maintenance and customization
- Constructed with forged aluminum cover and hardened wear points: Ensures long-lasting performance
- Engineered for smooth engagement: Soft, progressive engagement with minimal transmission noise
- Certified quality: 100% clamp load tested, balanced, and SFI certified
- Backed by industry-leading one-year warranty: Confidence in performance and durability
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
