The ACT SB10-HDSS kit pairs a Heavy Duty pressure plate with a Performance Street organic disc for street and light track use on the WRX STI platform. ACT's Heavy Duty pressure plate uses an exclusive diaphragm design to increase clamp load, reduce deflection, and extend clutch life. All diaphragms go through a four-stage heat-treating process, and precision cover stampings add rigidity and consistency. Heavy Duty pressure plates increase clamp load by 20 to 50 percent over stock. ACT's Performance Street discs are the brand's most popular disc, using premium organic friction material with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. A reduced marcel provides faster shift action to complement the pressure plate, with quiet operation and increased strength and reliability. The kit also includes ACT's Monoloc, a one-piece, direct replacement for the standard two-piece wedge collar and wire ring used in pull-type clutches. Monoloc's segmented retaining ring tension is carefully calculated and tested to provide uniform loading on the bearing and pressure plate for consistent alignment, regardless of driver input or vehicle modifications, and its hardened chrome-moly steel construction is built to last.
WarrantyInstallation Instructions
Specifications:
- Pressure Plate: Heavy Duty pressure plate, four-stage heat-treated diaphragm
- Disc: Performance Street organic disc
- Clamp Load: 20-50% increase over stock
- Retaining Ring: ACT Monoloc, one-piece hardened chrome-moly (included)
- Part Number: SB10-HDSS
Vehicle Applications:
- 2004 Subaru Impreza WRX STI
- 2005 Subaru Impreza WRX STI
- 2006 Subaru Impreza WRX STI
- 2007 Subaru Impreza WRX STI
- 2008 Subaru Impreza WRX STI
- 2009 Subaru Impreza WRX STI
- 2010 Subaru Impreza WRX STI
- 2011 Subaru Impreza WRX STI
- 2012 Subaru Impreza WRX STI
- 2013 Subaru Impreza WRX STI
- 2014 Subaru Impreza WRX STI
- 2007 Subaru Impreza WRX STI Limited
- 2011 Subaru Impreza WRX STI Limited
- 2012 Subaru Impreza WRX STI Limited
- 2013 Subaru Impreza WRX STI Limited
- 2014 Subaru Impreza WRX STI Limited
- 2010 Subaru Impreza WRX STI Special Edition
- 2007 Subaru Legacy GT spec.B
- 2008 Subaru Legacy GT spec.B
- 2009 Subaru Legacy GT spec.B
- 2015 Subaru WRX STI Base
- 2016 Subaru WRX STI Base
- 2017 Subaru WRX STI Base
- 2018 Subaru WRX STI Base
- 2019 Subaru WRX STI Base
- 2020 Subaru WRX STI Base
- 2021 Subaru WRX STI Base
- 2015 Subaru WRX STI Launch Edition
- 2015 Subaru WRX STI Limited
- 2016 Subaru WRX STI Limited
- 2017 Subaru WRX STI Limited
- 2018 Subaru WRX STI Limited
- 2019 Subaru WRX STI Limited
- 2020 Subaru WRX STI Limited
- 2021 Subaru WRX STI Limited
- 2019 Subaru WRX STI S209
- 2016 Subaru WRX STI Series.HyperBlue
- 2018 Subaru WRX STI Type RA
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 SB10-HDSS kit include?
The SB10-HDSS kit includes an ACT pressure plate, a matching disc, and ACT's Monoloc retaining ring.
What does ACT's Monoloc 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.
Is this kit suited for street or race use?
It is built around a 6-pad race-style disc paired with a performance pressure plate, making it best suited to dedicated race or heavy track/street use rather than a quiet daily-driver setup.
Does this kit fit the WRX STI and the Legacy GT spec.B?
Yes, this kit covers the 2004-2014 Subaru Impreza WRX STI, 2015-2021 WRX STI, and 2007-2009 Legacy GT spec.B. See the full Vehicle Applications list above to confirm the exact year and trim.
