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  See more parts for Subaru Impreza
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ACT HD-M/Perf Street Sprung Kit Subaru Impreza 2004-2022 - SB10-HDSS

ACT SB10-HDSS Heavy Duty Clutch Kit

If you're looking to upgrade your Subaru's clutch system, the ACT SB10-HDSS Heavy Duty Clutch Kit is a top-tier choice that combines durability with performance. Designed specifically for Subaru Impreza (2004-2014), Subaru Legacy (2007-2009), Subaru STI (2004-2021), and Subaru WRX (2013-2022), this kit features ACT's most popular heavy-duty pressure plate and street disc, making it an ideal solution for both daily driving and spirited track sessions.

Why Choose the ACT SB10-HDSS?

The ACT SB10-HDSS kit is engineered for those who demand more from their vehicles. It uses an exclusive diaphragm design that increases clamp load while reducing deflection, maximizing clutch life. Each diaphragm undergoes a rigorous four-stage heat-treating process, ensuring it can handle the heat generated during aggressive driving. This means you can shift with confidence, knowing your clutch can withstand the demands of both street and track.

Performance Features

  • Light to moderate pedal effort for a more comfortable driving experience.
  • Enhanced engagement with smooth, positive feedback during shifts.
  • Longer friction life thanks to ACT's unique diaphragm design.
  • Precision-engineered components for improved performance and reliability.
  • Includes ACT's patented Monoloc for optimal alignment and consistent performance.

Technical Specifications

  • Clutch Disc Diameter: 9.4 in (240 mm)
  • Torque Capacity: 522 ft/lbs (0.45 over OE)
  • Input Spline Quantity: 24
  • Input Shaft Diameter: 1 in
  • Disc Material: Organic with high copper content
  • Weight: 18.2 lbs
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Alignment Tool Included: Yes
  • Grease Included: Yes

Installation Information

For detailed installation instructions, CLICK HERE.

Real-World Feedback

Subaru WRX owners have reported that after installing the SB10-HDSS kit, they experienced significantly smoother shifts, especially during high RPMs. One owner noted, "The pedal feel is just right—firm but not overly stiff. I can confidently hit the track without worrying about clutch fade." Another Subaru STI driver mentioned, "This clutch kit has transformed my driving experience, providing the reliability I need for both daily commutes and weekend track days."

Notes

  • Includes ACT Monoloc for improved performance.

Fitment Details

This clutch kit is confirmed to fit the following models:

  • Subaru Impreza (2004-2014)
  • Subaru Legacy (2007-2009)
  • Subaru STI (2004-2021)
  • Subaru WRX (2013-2022)

Upgrade your Subaru's clutch system with the ACT SB10-HDSS Heavy Duty Clutch Kit and experience the difference in performance and reliability today!

Other Part Numbers:
ACT #actSB10-HDSS

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2004-2014
 Subaru Impreza
2007-2009
 Subaru Legacy
2004-2021
 Subaru STI
2013-2022
 Subaru WRX

ACT Banner

ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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