The ACT SB9-HDSS pairs ACT's Heavy Duty pressure plate with its Performance Street sprung disc and ACT's patented Monoloc for turbocharged Subaru WRX, Baja, Forester, and Legacy applications, plus the badge-engineered Saab 9-2X Aero. The Heavy Duty pressure plate uses ACT's exclusive diaphragm design to increase clamp load and reduce deflection, with every diaphragm going through a four-stage heat-treating process. The Performance Street disc uses premium organic friction material with high copper content for improved heat transfer and steel-backed lining for durability, with reduced marcel for faster shifts. 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 regardless of driver influence or vehicle modifications.
Specifications:
- Torque Capacity: 434 ft-lb (27% over OE)
- Product Weight: 16.3 lbs
- Disc Diameter: 9 in (228 mm)
- Pressure Plate: Heavy Duty, four-stage heat-treated diaphragm
- Disc Material: Organic, high-copper content, steel-backed lining
- Disc Style: Sprung hub
- Includes: ACT Monoloc, chrome-moly construction
- Pedal Feel: Light to moderate effort, smooth positive engagement, OE to mild gear rattle
- Recommended Use: Street and race use
- Part Number: SB9-HDSS
Vehicle Applications:
- 2005 Saab 9-2X Aero
- 2004 Subaru Baja Turbo
- 2005 Subaru Baja Turbo
- 2004 Subaru Forester XT
- 2005 Subaru Forester XT
- 2005 Subaru Forester XT Premium
- 2002 Subaru Impreza WRX
- 2003 Subaru Impreza WRX
- 2004 Subaru Impreza WRX
- 2005 Subaru Impreza WRX
- 2008 Subaru Legacy GT spec.B
- 2009 Subaru Legacy GT spec.B
- 1991 Subaru Legacy Sport
- 1992 Subaru Legacy Sport
- 1993 Subaru Legacy Sport
- 1994 Subaru Legacy 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 torque capacity does the SB9-HDSS handle?
The kit is rated for 434 ft-lb of torque capacity, a 27% increase over the factory clutch.
What is Monoloc and why is it included?
Monoloc is ACT's patented one-piece replacement for the standard two-piece wedge collar and wire ring in pull-type clutches. Its chrome-moly construction provides uniform, consistent loading on the bearing and pressure plate for longer release mechanism life.
Does the SB9-HDSS fit the Saab 9-2X?
Yes. The Saab 9-2X Aero was built on the same platform as the Subaru Impreza WRX and shares its clutch fitment, so the SB9-HDSS covers the 2005 9-2X Aero.
Is this kit suitable for daily driving?
Yes. It is engineered for light to moderate pedal effort with smooth, positive engagement and only OE to mild gear rattle, and is recommended for both street and race use.
