ACT Heavy Duty Performance Street Sprung Clutch Kit w/ Streetlite Flywheel - 2006-2026+ Subaru WRX (SB11-HDSS)

The Definitive Daily-Driver Clutch Upgrade
If you are running an aggressive street build, a full-bolt-on setup (FBO), or an upgraded flex-fuel map, your stock Subaru clutch won't survive for long. The ACT Heavy Duty Performance Street Sprung Clutch Kit (SB11-HDSS) is engineered to handle that extra power without destroying your leg. Rated to support 449 ft-lbs of torque at the crank (~380-400 wtq), this single-disc kit offers a 39% increase over your factory unit while maintaining a light to moderate pedal effort that is perfectly comfortable for daily commuting and heavy traffic.

Engineered Precision: The 240mm Conversion Advantage
The SB11-HDSS isn't just a standard replacement; it is a 240mm conversion kit. Early five-speed manual and split-case six-speed manual Subarus came equipped with a smaller 230mm clutch setup. By redesigning the pressure plate assembly around a larger 240mm footprint, ACT maximized the available surface friction area. This increases overall thermal capacity, drastically reduces fade during aggressive launches, and yields lower pedal effort compared to forcing a 230mm setup to hold the same power.

Every single ACT diaphragm undergoes an exclusive four-stage heat-treating process to guarantee uniform clamp force, while the entire kit is dynamically computer-balanced for smooth operations at high-RPM rev limits.

• Street-Friendly Engagement: The full-face organic sprung disc guarantees smooth, chatter-free engagement with near-OEM pedal weight.
• Steel-Backed Linings: Premium organic friction material with a high copper content increases heat dissipation and improves burst strength.
• Streetlite Flywheel Included: Comes bundled with ACT’s precision billet steel flywheel, allowing quicker throttle response without sacrificing daily-driver inertia.
• Comprehensive Kit: Includes everything required for an out-of-the-box installation.

Technical Specifications:

• Part Number: SB11-HDSS
• Torque Capacity: 449 ft-lbs (At Crank)
• Disc Style: Full Face Performance Organic Street Disc
• Hub Style: Sprung Centered
• Disc Diameter: 240mm (9.4 in.)
• Spline Count / Input Shaft: 24-Spline / 1.000 in.
• Pressure Plate Type: Heavy Duty
• Flywheel Type: Streetlite (Billet Steel)
• Product Total Weight: 28.6 lbs.

Fitment:

• Subaru WRX: 2006–2014 (2.5L Turbo 5-Speed Manual — Base, Premium, Limited, TR, SE)
• Subaru WRX: 2015–2021 (2.0L Turbo 6-Speed Manual — Base, Premium, Limited, Sport, Sport-tech, Raiu, RS)
• Subaru WRX: 2022–2026 (2.4L Turbo 6-Speed Manual — Base, Premium, Limited, TR, RS, tS, High, Series.Yellow)
• Subaru Legacy GT / 2.5GT: 2005–2012 (Includes Limited and spec.B)
• Subaru Outback XT / 2.5 XT: 2005–2009 (Includes Limited)
• Subaru Forester XT / Sports XT: 2006–2008 (Includes Limited)
• Subaru Baja Turbo: 2006
• Subaru Impreza WRX STi [JDM Models ONLY]: 2006–2007

Important Notes:

• This is a standalone conversion package. Because it jumps up to a 240mm surface footprint, you must use the included ACT Streetlite Flywheel. It is not compatible with standard 230mm factory flywheels.
• This kit does NOT fit United States Domestic Market (USDM) Subaru WRX STI models (2004–2021). For USDM STI 6-speed applications, please check out the ACT SB10-HDSS for STI models.

The Nameless "Installation" Pro-Tip:

The Break-In Rule is Law: Do not throw your car on the dyno or immediately practice launches right after getting this clutch dropped in. Full-face organic street discs require a mandatory 500-mile break-in period consisting of normal stop-and-go city driving. This lets the friction linings smoothly seat against the fresh pressure plate and flywheel faces. If you skip this window or subject it to high-heat highway slips too early, you risk glazing the disc and causing premature slippage. Be patient, save your clutch!

Installation Note: Always replace your flywheel bolts when installing a new unit. We highly recommend picking up a fresh set of high-tensile ARP Flywheel Bolt Kit (260-2801) to ensure proper torque retention and safety against the crank.