The ACT SB12-XTG6 Extreme 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 an ACT Xtreme pressure plate, for the most demanding drivers, with a 6-pad, spring-centered ceramic race disc on ACT's proven 240mm clutch design. The Xtreme pressure plate uses the same exclusive diaphragm design and four-stage heat-treating process as ACT's Heavy Duty plates, with higher clamp load for maximum torque capacity.
Specifications
- Clutch Design: 240mm (upgrade from OE 230mm clutch/flywheel)
- Torque Capacity: Rated up to 681 ft-lb at the crank
- Disc Material: Cerametallic, 6-pad sprung hub
- Pressure Plate Type: Xtreme (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-XTG6
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 is the difference between the SB12-XTG6 and SB12-HDG6?
The SB12-XTG6 uses an Xtreme pressure plate with higher clamp load than the Heavy Duty plate on the SB12-HDG6, for drivers running higher horsepower who need maximum torque capacity from the same 6-pad race disc.
Does the SB12-XTG6 include a flywheel?
Yes, it includes a Chromoly XACT Prolite flywheel (#600895) along with clutch hardware, a release bearing, and an alignment tool.
Will pedal effort increase with the Xtreme pressure plate?
Yes. ACT's Xtreme pressure plates typically increase pedal effort by 50-80% over stock, more than the 15-40% increase seen with a Heavy Duty plate.
What torque capacity does the SB12-XTG6 handle?
It is rated to hold up to 681 ft-lb at the crank on the 6-pad race disc.
