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  See more parts for Subaru Impreza
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ACT Heavy Duty Performance Street Sprung Clutch Kit w/ Monoloc Subaru Impreza | Legacy | WRX 2002-2021 - SB10-HDSS
SB10-HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's Performance street discs are the most popular disc purchased. They feature premium organic materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs feature a reduced marcel for faster shift action to complement ACT pressure plates. Quiet operation with increased strength and reliability. Monoloc is a one-piece, direct replacement or upgrade to the standard, two-piece wedge collar and wire ring featured in pull-type clutches. The spring tension of the segmented retaining ring is carefully calculated and tested for optimal performance. It provides uniform loading on the bearing and pressure plate to assure proper alignment, regardless of driver influence or vehicle modifications. Monoloc's hardened chrome-moly steel construction will provide years of service.

  • Description Feel: Light to moderate pedal effort, smooth positive engagement, OE to mild gear rattle, confidence during hard shifts
  • Life: Longer friction life, extended by ACT's exclusive diaphragm design, dramatic improvement in release mechanism life
  • Quality: Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade, major improvement in release mechanism
  • Recommended Use: Recommended for street and race use
  • ACT Difference: 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT's patented Monoloc


    • Install Instructions:

    Specifications:
    • Item Description: ACT Heavy Duty Performance Street Sprung Clutch Kit with Monoloc
    • Product Weight (lbs.): 18.2
    • Torque Capacity (ft/lbs.): 522
    • Torque Capacity Over OE: 45%
    • Disc Material: Organic
    • Clutch Disc Diameter (Inches): 9.4
    • Clutch Disc Diameter (Millimeters): 240
    • Input Shaft Diameter (inches): 1
    • Pressure Plate Type: Heavy Duty


    Fitment:
    • Subaru Impreza WRX Sti [JDM] 2.0L F4 FI| T 2002-2003
    • Subaru Impreza WRX STI 2.5 H4 GAS FI 2458cc | DOHC | Turbocharged 2004-2014
    • Subaru Impreza WRX Sti [JDM] 2.0L F4 FI| T 2004-2005
    • Subaru Impreza WRX STI Limited 2.5 H4 GAS FI 2458cc | DOHC | Turbocharged 2007, 2011-2014
    • Subaru Impreza WRX STI Special Edition 2.5 H4 GAS FI 2458cc | DOHC | Turbocharged 2010
    • Subaru Legacy GT spec.B 2.5 H4 GAS FI 2458cc | DOHC 2007-2009
    • Subaru WRX STI 2.5 H4 GAS FI 2458cc | DOHC 2013-2016
    • Subaru WRX STI Base 2.5 H4 GAS FI 2458cc | DOHC 2013-2021
    • Subaru WRX STI Kanrai Edition 2.5 H4 GAS FI 2458cc | DOHC 2020
    • Subaru WRX STI Launch Edition 2.5 H4 GAS FI 2458cc | DOHC 2015
    • Subaru WRX STI Limited 2.5 H4 GAS FI 2458cc | DOHC 2015-2021
    • Subaru WRX STI S209 2.5 H4 GAS FI 2458cc | DOHC 2019
    • Subaru WRX STI Series.HyperBlue 2.5 H4 GAS FI 2458cc | DOHC 2016
    • Subaru WRX STI Sport 2.5 H4 GAS FI 2458cc | DOHC 2017-2021
    • Subaru WRX STI Sport-tech 2.5 H4 GAS FI 2458cc | DOHC 2013-2021
    • Subaru WRX STI STI 2.5 H4 GAS FI 2458cc | DOHC 2018-2021
    • Subaru WRX STI Tsurugi Edition 2.5 H4 GAS FI 2458cc | DOHC 2014
    • Subaru WRX STI Type RA 2.5 H4 GAS FI 2458cc | DOHC 2018


    Notes:
    • Includes ACT Monoloc.

    Other Part Numbers:
    ACT #actSB10-HDSS

    Proposition 65

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

    Vehicle Make/Model
    Subaru Impreza 2004-2014 WRX STI
    Subaru Impreza 2007, 2011-2014 WRX STI Limited
    Subaru Impreza 2010 WRX STI Special Edition
    Subaru Legacy 2006-2009 GT spec.B
    Subaru WRX STI 2013-2014, 2017-2021 Sport-tech
    Subaru WRX STI 2013-2021 Base
    Subaru WRX STI 2014 Tsurugi Edition
    Subaru WRX STI 2015 Launch Edition
    Subaru WRX STI 2015-2021 Limited
    Subaru WRX STI 2016 Series.HyperBlue
    Subaru WRX STI 2017-2021 Sport
    Subaru WRX STI 2018 Type RA
    Subaru WRX STI 2018-2021 STI
    Subaru WRX STI 2019 S209
    Subaru WRX STI 2020 Kanrai Edition

    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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