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Impreza WRX STI, Legacy Clutch Kit - Monoloc HD Pressure Plate With Race Sprung 4 Pad Disc

MSRP $744.00
  • Low to Moderate Pedal Feel
  • Aggressive Engagement w/ Stock to Low to Moderate Gear Rattle
  • Monoloc Provides Uniform Loading on the Bearing & Pressure Plate to Assure Proper Alignment
  • Premium Ceramic Friction Materials Provide Low Wear Rates & High Heat Tolerance
  • The Spring Tension of the Segmented Retaining Ring is Carefully Calculated & Tested for Optimal Performance
  • Four Pads Provide for the Quickest Shifting
  • Recommended for High Horsepower Street or Race Use
  • All ACT Pressure Plates Are Dynamically Computer Balanced for Smooth Operation at High RPM
  • Monoloc is a 1-piece, Direct Replacement or Upgrade to the Std., 2-piece Wedge Collar & Wire Ring Featured in Pull-type Clutches
  • Inclds 4 Pad Sprung Race Disc, Heavy Duty Monoloc Pressure Plate, Pilot Bearing, Release Bearing & Alignment Tool
Mfg Part # : SB10-HDG4


This kit features ACT's most popular Heavy Duty pressure plate. 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 4-pad spring-centered race disc features a spring-center construction to properly damp torsional vibrations for quieter operation and resist failure even under harsh conditions. ACT spring retainers utilize wraparound spring windows and thicker retainer stampings to provide spring support, reduce stress concentrations, and increase strength and reliability. With the 4-pad spring-centered race disc, engagement is harsher, but shifting is faster. ACT's 4-pad spring-centered race disc is well-suited for smaller disc sizes in smaller engines. 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.



About ACT Parts & Accessories

ACT's mission is to serve our customers in an extraordinary way with business excellence, outstanding product quality, and exceptional value which meets even the most challenging needs of our customers. ACT leads the industry in performance clutches and flywheels by manufacturing an extensive product line, including single disc clutches, twin disc clutches, carbon clutches and flywheels. Our Mission is to advance a family of people committed to innovation, measurable results and well developed systems of operation which provide adventure, quality and efficiency. Each ACT product is unparalleled in strength, durability and materials. ACT products combine all the features needed in a performance clutch or flywheel with many different combinations to choose from. Materials used from design to production provide the platform for a solid engineered part. ACT provides quality that lasts, materials that work and processes that perform to ensure calculated results. Simple yet advanced. Finite Element Analysis: ACT uses powerful Finite Element Analysis (FEA) computer software to test and evaluate products in a virtual environment. The FEA software accompanies the latest CAD and 3D solid modeling software used by ACT's research and development department so that numerous design alternatives can be considered long before coming to market with a new product. ACT's FEA software mechanical stress, heat transfer, thermal stress, vibration and buckling analysis under virtually any load condition which can help identify potential problems in a particular design. Custom Data Recording Press: ACT uses a computer operated data recording press to cycle, test and record pressure plate clamp load, working range, release load and release travel. Each pressure plate is load tested and cycled to ensure parts meet ACT's strict quality standards. This special equipment makes testing accurate, efficient, and thorough so both existing parts and prototype designs can be quickly evaluated. This equipment also allows ACT to create custom setups for customers and give them a dyno sheet for that exact assembly. Laboratory Testing: Utilizing the latest in laboratory testing, ACT continues to experiment with different friction materials and design alternatives for future product development. Friction material tests help ACT to evaluate coefficient of friction, fade, wear, and recovery under different load, speed and temperature conditions. Laboratory burst testing and material testing is performed on parts for SFI certification on a scheduled basis and regularly performed on new parts.


  • 2004 - 2006 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl; Turbocharged;
  • 2007 Subaru Impreza - WRX STI Limited; 2.5 L; 4 Cyl; Turbocharged;
  • 2007 - 2010 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl; Turbocharged;
  • 2010 Subaru Impreza - WRX STI Special Edition; 2.5 L; 4 Cyl; Turbocharged;
  • 2011 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl; Turbocharged;
  • 2011 Subaru Impreza - WRX STI Limited; 2.5 L; 4 Cyl;
  • 2012 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl;
  • 2012 Subaru Impreza - WRX STI Limited; 2.5 L; 4 Cyl;
  • 2013 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl;
  • 2013 Subaru Impreza - WRX STI Limited; 2.5 L; 4 Cyl;
  • 2014 Subaru Impreza - WRX STI; 2.5 L; 4 Cyl;
  • 2014 Subaru Impreza - WRX STI Limited; 2.5 L; 4 Cyl;
  • 2007 - 2009 Subaru Legacy - GT spec.B; 2.5 L; 4 Cyl;


Impreza WRX STI, Legacy Clutch Kit - Monoloc HD Pressure Plate With Race Sprung 4 Pad Disc

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