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  See more parts for Subaru Impreza
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ACT HD-M/Race Rigid 4 Pad Kit Subaru Impreza | Legacy | STI | WRX 2000-2021 - SB10-HDR4

ACT SB10-HDR4 Heavy Duty Clutch Kit

If you?re a Subaru owner looking to upgrade your clutch system, the ACT SB10-HDR4 Heavy Duty Clutch Kit is a solid choice for those who demand performance and reliability. Designed for various models including the Subaru Impreza (2000-2021), Subaru Legacy (2005-2009), Subaru STI (2004-2021), and Subaru WRX (2013-2016), this kit is engineered to handle the rigors of spirited driving and track days.

Performance Features

  • Utilizes ACT's renowned Heavy Duty pressure plate, featuring an exclusive diaphragm design that increases clamp load while reducing deflection for maximum clutch life.
  • Constructed with high-quality ceramic friction materials, the 4-pad rigid race discs offer a lightweight design that allows for quicker shifts and smoother operation.
  • The chrome-moly hub is heat-treated for enhanced strength and durability, ensuring that it can withstand the demands of high-performance driving.
  • Expect a more aggressive engagement with this setup, which translates to faster shifts and a more connected driving experience.
  • Includes ACT's patented Monoloc, a one-piece direct replacement that improves alignment and performance under various driving conditions.

Installation and Compatibility

Installing the SB10-HDR4 is straightforward for those who enjoy wrenching on their own vehicles. For detailed installation instructions, CLICK HERE.

Specifications

  • Clutch Disc Diameter: 9.4 in (240 mm)
  • Torque Capacity: 668 ft/lbs
  • Input Spline Quantity: 24
  • Input Shaft Diameter: 1 in
  • Weight: 15.9 lbs
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Grease Included: Yes
  • Pilot Bearing Included: Yes
  • Disc Material: Ceramic
  • Disc Type: Solid

Customer Feedback

Subaru WRX owners have reported noticeable improvements in shift speeds and overall clutch feel after installing the SB10-HDR4. One owner mentioned, "After putting this clutch in my 2015 WRX, the shifts are so much quicker and precise. I can definitely feel the difference during hard acceleration!"

Notes

  • This kit is recommended for race use only, providing light to moderate pedal effort with aggressive engagement.
  • Keep in mind that while the engagement is harsher, it significantly enhances performance, especially in track settings.

Fitment

The ACT SB10-HDR4 is compatible with the following Subaru models:

  • Subaru Impreza (2000-2021)
  • Subaru Legacy (2005-2009)
  • Subaru STI (2004-2021)
  • Subaru WRX (2013-2016)

Upgrade your Subaru's clutch system with the ACT SB10-HDR4 Heavy Duty Clutch Kit and experience the difference in performance and reliability on the road or track.

Other Part Numbers:
ACT #actSB10-HDR4

Proposition 65

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

Vehicle
2000-2021
 Subaru Impreza
2005-2009
 Subaru Legacy
2004-2021
 Subaru STI
2013-2016
 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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