The ACT T1R-S05 Mod-Twin 225 HD Sprung Race Kit delivers aggressive launches and smoother shifting in high-powered AWD platforms by combining twice the ceramic friction surface of a single-disc setup with an ultra-durable Mono-Drive sprung hub assembly in a fully modular design. Each diaphragm spring undergoes ACT's exclusive four-stage heat-treating process for a consistent, light pedal feel. Puck-style friction plates deliver a high friction coefficient, superior heat capacity, and long clutch life, uniformly transferring torque to the Mono-Drive sprung hub assembly, which extends input shaft life and reduces driveline shock from torsional vibration. 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). Mod-Twin clutches are fully rebuildable and most components can be ordered separately.
WarrantyInstallation Instructions
Specifications:
- Kit Type: Mod-Twin 225, twin-disc, sprung hub
- Torque Capacity: 895 ft-lb (not for street use)
- Friction Plates: Puck-style ceramic
- Hub: Mono-Drive sprung hub assembly
- Retaining Ring: ACT Monoloc, patented one-piece collar
- Included Components: Flywheel, pressure plate cover, diaphragm spring, face, friction plates, sprung hub assembly, floater, Monoloc collar, release bearing, alignment tool, pilot bearing (if needed)
- Rebuildable: Yes, most components available separately
- Recommended Use: Race use only, not for street use
- Warranty: 1-year ACT limited warranty
- Part Number: ACTT1R-S05
Vehicle Applications:
- 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
Warning: This product can expose you to chemicals including carbon black, glass wool fibers, or silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov
FAQ
What is the torque capacity of the ACT T1R-S05 kit?
895 ft-lb. ACT specifies this kit for race use only and not for street use.
What does 'Mod-Twin' mean?
Mod-Twin refers to ACT's modular twin-disc design, which doubles the ceramic friction surface of a single-disc clutch while remaining fully rebuildable, with most components available separately.
What is included in the T1R-S05 kit?
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, ACT Monoloc collar, release bearing, alignment tool, and pilot bearing if needed.
Does this kit fit all WRX STI model years from 2004-2020?
Yes, it covers the 2004-2014 Impreza WRX STI and 2015-2021 WRX STI (Base, Limited, Launch Edition, S209, Series.HyperBlue, and Type RA trims). See the full Vehicle Applications list above to confirm the exact year and trim.