The ACT SB9-HDSS kit pairs a Heavy Duty pressure plate with a Performance street organic disc for street and light track use on the early WRX 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, with a reduced marcel for faster shift action and quiet, reliable operation. 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: 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
- 2007 Subaru Legacy GT spec.B
- 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 does the SB9-HDSS kit include?
The SB9-HDSS kit includes an ACT Heavy Duty pressure plate, a Performance street organic 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?
Yes, it pairs a Heavy Duty pressure plate with a Performance street organic disc for smooth street and light track driving.
What vehicles does this kit fit?
Yes, this kit covers the 2002-2005 Subaru Impreza WRX, Forester XT/XT Premium (2004-2005), Baja Turbo (2004-2005), Legacy GT spec.B (2007-2009), Legacy Sport (1991-1994), and Saab 9-2X Aero (2005). See the full Vehicle Applications list above to confirm the exact year and trim.