The ACT SB12-HDG6 Heavy Duty Race Sprung 6 Pad Clutch Kit is part of ACT's newly expanded SB12 lineup for the Subaru WRX, built on ACT's proven SB11 clutch combination with an added ACT Prolite flywheel for quicker engine response, improved acceleration, and reduced rotational inertia. The kit pairs ACT's Heavy Duty pressure plate with a 6-pad, spring-centered ceramic race disc on ACT's proven 240mm clutch design, delivering increased heat capacity and durability for both street and track use. The 6-pad race disc gives harsher engagement than a street disc but faster shifting, and is recommended for larger clutch sizes to absorb more heat.
Specifications
- Clutch Design: 240mm (upgrade from OE 230mm clutch/flywheel)
- Torque Capacity: Rated up to 681 ft-lb at the crank (Race disc)
- Disc Material: Cerametallic, 6-pad sprung hub
- Pressure Plate Type: Heavy Duty (exclusive diaphragm design, four-stage heat-treated)
- SFI Rated: 1.1
- Flywheel Type: Prolite (included, ACT #600895)
- Includes: Chromoly XACT Prolite flywheel #600895, clutch hardware, release bearing, alignment tool
- Warranty: 12 Months
- Part Number: SB12-HDG6
Vehicle Applications
Per ACT's official June 2026 product release, the SB12 lineup covers the following:
| Year | Make | Model |
|---|---|---|
| 2005 | Subaru | WRX |
| 2006 | Subaru | WRX |
| 2007 | Subaru | WRX |
| 2008 | Subaru | WRX |
| 2009 | Subaru | WRX |
| 2010 | Subaru | WRX |
| 2011 | Subaru | WRX |
| 2012 | Subaru | WRX |
| 2013 | Subaru | WRX |
| 2014 | Subaru | WRX |
| 2015 | Subaru | WRX |
| 2016 | Subaru | WRX |
| 2017 | Subaru | WRX |
| 2018 | Subaru | WRX |
| 2019 | Subaru | WRX |
| 2020 | Subaru | WRX |
| 2021 | Subaru | WRX |
| 2022 | Subaru | WRX |
| 2023 | Subaru | WRX |
| 2024 | Subaru | WRX |
| 2025 | Subaru | WRX |
| 2026 | Subaru | WRX |
California Prop 65 Warning: This product can expose you to chemicals including carbon black, glass wool fibers, and 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.
Frequently Asked Questions
What makes the SB12-HDG6 different from the SB11/SB10 kits?
The SB12 lineup is built on ACT's proven SB11 clutch combination but adds an ACT Prolite flywheel (#600895) as standard equipment, upgrading the OE 230mm clutch and flywheel to a higher-torque-capacity 240mm system.
Does the SB12-HDG6 include a flywheel?
Yes, it includes a Chromoly XACT Prolite flywheel along with clutch hardware, a release bearing, and an alignment tool.
What torque capacity does the SB12-HDG6 handle?
The 6-pad race disc configuration is rated to hold up to 681 ft-lb at the crank.
Is the SB12-HDG6 street-drivable?
The 6-pad, spring-centered race disc has harsher engagement than a street disc but is recommended for track use and high-performance street or race builds seeking maximum durability.