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The Most Capable Street Clutch and Flywheel Package for the Modified 2006-2025 Subaru WRX
The ACT SB12-XTSS upgrades the 2006-2025 Subaru WRX from the factory 230mm clutch to a higher-capacity 240mm system, pairing the Xtreme pressure plate with the Performance Street organic disc and an ACT XACT Prolite chromoly flywheel weighing just 8.5 pounds. The ACT SB12-XTSS delivers 532 lb-ft of torque capacity at the crank, making it the strongest street-spec ACT kit available for the WRX platform while still using a sprung hub organic disc for smooth daily engagement. Compatible with 2.5L turbo EJ255, EJ257, FA20, FA24, and JDM EJ25 engines across 5-speed and 6-speed transmissions, the SB12-XTSS is purpose-built for enthusiasts who demand maximum clamping force without sacrificing daily drivability on modified or tuned WRX builds.
Key Features
- ACT SB12-XTSS uses the Xtreme pressure plate, delivering 532 lb-ft of torque capacity for demanding modified WRX builds
- Upgrades from factory 230mm to a higher-capacity 240mm clutch diameter for increased heat capacity and durability
- Includes ACT XACT Prolite chromoly steel flywheel at 8.5 lbs, reducing rotational inertia for sharper throttle response
- Performance Street organic disc with sprung hub provides smooth, drivable engagement for daily use
- Exclusive diaphragm design with four-stage heat-treating process for maximum clamp load and clutch longevity
- Precision cover stampings maintain rigidity and consistency across all operating conditions
- Fits 2006-2025 Subaru WRX with EJ255, EJ257, FA20, FA24, and JDM EJ25 engines, 5-speed and 6-speed transmissions
- Complete kit includes flywheel, clutch hardware, release bearing, and alignment tool
- Backed by ACT limited warranty
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2006-2014 | Subaru | Impreza | WRX |
| 2006-2014 | Subaru | Impreza | WRX Limited |
| 2009-2014 | Subaru | Impreza | WRX Premium |
| 2006-2007 | Subaru | Impreza | WRX TR |
| 2015-2025 | Subaru | WRX | Limited |
| 2015-2025 | Subaru | WRX | Premium |
| 2024 | Subaru | WRX | TR |
| 2025 | Subaru | WRX | TS |
| 2005-2006 | Subaru | Legacy | GT |
| 2005-2009 | Subaru | Legacy | GT Limited |
| 2006-2009 | Subaru | Legacy | GT spec.B |
| 2006-2008 | Subaru | Forester | XT Limited |
| 2008 | Subaru | Forester | Sports 2.5 XT |
Specifications
| Detail | Value |
|---|---|
| Part Number | SB12-XTSS |
| UPC | N/A |
| Pressure Plate | ACT Xtreme |
| Disc Type | Performance Street Organic, Sprung Hub |
| Clutch Diameter | 240mm |
| Torque Capacity | 532 lb-ft at crank |
| Flywheel | ACT XACT Prolite Chromoly Steel |
| Flywheel Weight | 8.5 lbs |
| Engine Fitment | EJ255, EJ257, FA20, FA24, JDM EJ25 |
| Transmission | 5-speed and 6-speed |
| Hub Style | Sprung |
| Street Use | Yes |
| Warranty | ACT Limited Warranty |
What's Included
- ACT Xtreme pressure plate assembly
- ACT Performance Street organic disc (sprung hub)
- ACT XACT Prolite chromoly flywheel (8.5 lbs)
- Release bearing
- Clutch alignment tool
- Mounting hardware
About ACT (Advanced Clutch Technology)
Advanced Clutch Technology (ACT) is a California-based manufacturer of high-performance clutch systems trusted by enthusiasts, racers, and professional builders worldwide. ACT engineers every component in-house, using proprietary diaphragm designs, multi-stage heat-treating processes, and precision cover stampings to produce clutch systems that outlast and outperform the competition. The SB12-XTSS is part of ACT's expanded Subaru WRX lineup designed to handle the power demands of tuned and modified EJ and FA series turbo engines.
Frequently Asked Questions
What is the difference between the ACT SB12-XTSS and the SB12-HDSS for the Subaru WRX?The SB12-XTSS uses ACT's Xtreme pressure plate, which delivers a higher clamp load and 532 lb-ft of torque capacity compared to the SB12-HDSS which uses the Heavy Duty plate and is rated at 449 lb-ft. Both use the Performance Street organic sprung disc for smooth daily engagement, but the SB12-XTSS is the stronger option for more heavily modified or higher-power builds.
Does the ACT SB12-XTSS fit the 2022-2025 Subaru WRX with the FA24 engine?Yes. The SB12-XTSS is compatible with the FA24 turbocharged engine found in the 2022-2025 Subaru WRX, in addition to earlier EJ255, EJ257, FA20, and JDM EJ25 applications across both 5-speed and 6-speed transmissions.
Will the ACT SB12-XTSS work on the Subaru WRX STI?No. The SB12-XTSS is designed for the Subaru WRX and is not compatible with the STI, which uses a different clutch diameter and transmission specification. ACT offers separate clutch kits specifically engineered for the STI application.
Is the ACT SB12-XTSS drivable as a daily driver?Yes. The Performance Street organic disc with a sprung hub provides progressive, smooth engagement similar to a factory clutch, making the SB12-XTSS suitable for daily driving even with the Xtreme pressure plate. Pedal effort will be moderately higher than stock but manageable for regular street use.
What is the ACT XACT Prolite flywheel made of and how much does it weigh?The XACT Prolite flywheel included with the SB12-XTSS is made from chromoly steel and weighs 8.5 pounds. This is significantly lighter than the factory flywheel, reducing rotational inertia and improving throttle response and acceleration feel, particularly in high-rpm applications.
Does the ACT SB12-XTSS require any modifications to install on the Subaru WRX?No modifications are required. The SB12-XTSS is a direct-replacement bolt-on kit designed to fit the factory bell housing and transmission of the 2006-2025 Subaru WRX without cutting, welding, or custom fabrication. Professional installation is recommended given the complexity of clutch and flywheel replacement.
How does the 240mm upgrade in the SB12-XTSS benefit modified WRX builds?The 240mm clutch diameter increases the contact area between the disc and flywheel, which translates to higher heat capacity, improved torque handling, and longer service life under high-load conditions compared to the factory 230mm system. This makes the SB12-XTSS particularly well-suited for WRX builds running aggressive tunes, upgraded turbochargers, or higher boost levels.
Is the ACT SB12-XTSS covered by a warranty?Yes. ACT backs the SB12-XTSS with a limited warranty against defects in materials and workmanship. Contact ACT directly or your authorized ACT dealer for warranty claim procedures and terms.
Does the ACT SB12-XTSS fit the Subaru Impreza WRX years 2006-2014?Yes. The SB12-XTSS fits 2006-2014 Subaru Impreza WRX models including the WRX, WRX Limited, WRX Premium, and WRX TR trims across applicable engine and transmission configurations.
Installation Instructions
- Lift the vehicle safely and remove the transmission following the factory service manual procedure for the specific WRX model year
- Remove the factory clutch assembly and flywheel from the crankshaft
- Clean the crankshaft mounting surface and inspect the crankshaft rear main seal for leaks before installation
- Install the ACT XACT Prolite flywheel onto the crankshaft using the provided hardware, torquing to the manufacturer-specified value
- Insert the ACT clutch alignment tool through the disc hub and into the pilot bearing to center the disc precisely
- Position the ACT Performance Street disc against the flywheel face with the transmission side facing outward
- Install the ACT Xtreme pressure plate over the disc and torque the bolts to specification in a star pattern
- Install the included release bearing into the transmission bell housing
- Reinstall the transmission and reconnect all drivetrain components per factory specification
- Bed in the clutch with several moderate acceleration and deceleration cycles before applying full power
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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