The ACT SB10-XTSS Extreme Performance Street Sprung Clutch Kit pairs an Xtreme pressure plate with a Performance street organic disc for demanding street and track driving. The Xtreme pressure plate's diaphragm design increases clamp load and reduces deflection to extend clutch life, and every diaphragm undergoes ACT's four-stage heat-treating process. Precision cover stampings add rigidity and consistency to the pressure plate. The included Performance street disc uses premium organic friction material with higher copper content for improved heat transfer and steel-backed lining for greater burst strength, with a reduced marcel for faster shift action. The kit also includes ACT's Monoloc, a one-piece, direct replacement for the standard two-piece wedge collar and wire ring found in pull-type clutches; its hardened chrome-moly construction provides uniform loading on the bearing and pressure plate for consistent alignment regardless of driver input or vehicle modifications.
Specifications:
- Torque Capacity: 598 ft-lb (68% over OE)
- Product Weight: 18.2 lbs
- Pressure Plate: Xtreme, four-stage heat-treated diaphragm
- Disc Material: Organic, reduced marcel for faster shift action
- Friction Surface: 9.4 in / 240mm
- Retaining Ring: ACT Monoloc, one-piece hardened chrome-moly (included)
- Recommended Use: Street and race use
Vehicle Applications:
- 2004 Subaru Impreza WRX STI
- 2005 Subaru Impreza WRX STI
- 2006 Subaru Impreza WRX STI
- 2007 Subaru Impreza WRX STI
- 2007 Subaru Legacy GT spec.B
- 2008 Subaru Impreza WRX STI
- 2008 Subaru Legacy GT spec.B
- 2009 Subaru Impreza WRX STI
- 2009 Subaru Legacy GT spec.B
- 2010 Subaru Impreza WRX STI
- 2010 Subaru Impreza WRX STI Special Edition
- 2011 Subaru Impreza WRX STI
- 2012 Subaru Impreza WRX STI
- 2013 Subaru Impreza WRX STI
- 2013 Subaru WRX STI
- 2013 Subaru WRX STI Base
- 2014 Subaru Impreza WRX STI
- 2014 Subaru WRX STI
- 2014 Subaru WRX STI Base
- 2014 Subaru WRX STI Tsurugi Edition
- 2015 Subaru WRX STI
- 2015 Subaru WRX STI Base
- 2015 Subaru WRX STI Launch Edition
- 2015 Subaru WRX STI Limited
- 2016 Subaru WRX STI
- 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
- 2017 Subaru WRX STI Sport
- 2018 Subaru WRX STI Base
- 2018 Subaru WRX STI Limited
- 2018 Subaru WRX STI Sport
- 2018 Subaru WRX STI STI
- 2018 Subaru WRX STI Type RA
- 2019 Subaru WRX STI Base
- 2019 Subaru WRX STI Limited
- 2019 Subaru WRX STI Sport
- 2020 Subaru WRX STI Base
- 2020 Subaru WRX STI Limited
- 2020 Subaru WRX STI Sport
- 2020 Subaru WRX STI STI
- 2021 Subaru WRX STI Base
- 2021 Subaru WRX STI Limited
- 2021 Subaru WRX STI Sport
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 does the ACT Monoloc included in this kit do?
Monoloc is a one-piece, direct replacement for the standard two-piece wedge collar and wire ring used in pull-type clutches. Its hardened chrome-moly construction provides uniform loading on the bearing and pressure plate for consistent alignment, regardless of driver input or vehicle modifications.
What is the torque capacity of the SB10-XTSS kit?
598 ft-lb, a 68% increase over the factory clutch.
Is this kit suited for daily street driving or track use?
Both. ACT rates it for street and race use, with moderate-to-heavy pedal effort, smooth positive engagement, and OE to mild gear rattle.
Does this kit fit the 2018 WRX STI Type RA?
Yes, the SB10-XTSS covers the 2018 WRX STI Type RA along with WRX STI Base, Limited, and Sport trims from 2013-2021, plus 2004-2014 Impreza WRX STI and 2007-2009 Legacy GT spec.B. See the full Vehicle Applications list above to confirm the exact year and trim.
