• ACT Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc | Subaru WRX (02-05) (SB9-HDR4)
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ACT Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc | Subaru WRX (02-05) (SB9-HDR4)

ACT Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc | Subaru WRX (02-05) (SB9-HDR4)

SB9-HDR4

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$710.00 USD
$876.00 USD $710.00 USD
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The ACT Heavy Duty Race Rigid 4 Pad Clutch Kit with Monoloc is a high-performance clutch assembly designed for Subaru WRX models from 2002 to 2005. This kit features ACT's most popular Heavy Duty pressure plate, which utilizes an exclusive diaphragm design to increase clamp load, reduce deflection, and extend clutch life. The pressure plate undergoes a four-stage heat-treating process to ensure durability and consistent performance under demanding conditions. The clutch disc incorporates high-quality ceramic friction materials and a chrome-moly hub, providing excellent heat resistance and engagement characteristics. Overall, this assembly delivers increased holding capacity and reliable operation for spirited driving and racing applications.

Designed specifically for 2002-2005 Subaru WRX models, this clutch kit is a direct replacement for stock components, offering a robust upgrade for street and track use. It is suitable for vehicles with modified or stock engines requiring enhanced clamping force and durability. The kit includes a four-pad rigid race disc and a Monoloc release bearing, ensuring proper fitment and smooth engagement. Installation is straightforward for experienced technicians familiar with clutch replacement procedures. This clutch assembly is ideal for performance enthusiasts seeking increased power handling, improved pedal feel, and long-lasting performance in high-stress driving scenarios.

Overview

ACT HD/Perf Street Sprung

ACT's kit features their 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 rigid race discs are made with high quality, ceramic friction materials. The chrome-moly hub is heat-treated for strength and durability. The lightweight, rigid design allows for quicker shifts and smooth, trouble-free service. With the 4-pad rigid race disc engagement is harsher, but shifting is faster.

The 4-pad rigid race disc is well-suited for the 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.

Features

  • Torque Capacity (ft/lbs.): 550
  • Light to moderate pedal effort, aggressive engagement, increased gear rattle, confidence during hard shifts
  • Moderate friction life, extended by ACT's exclusive diaphragm design, dramatic improvement in release mechanism life, rigid design may increase spline wear
  • Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance, major improvement in release mechanism
  • Recommended for race use only
  • 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT's patented Monoloc

Applications

  • 2002-2005 Subaru Impreza WRX
  • *2002 WRX Must be used with ACT flywheel or 2003 to 2005 WRX flywheel
  • 2004-2005 Subaru Forester XT
  • *Must be used with ACT flywheel or 2003 to 2005 WRX flywheel
  • 2008 Subaru Legacy GT spec.B
  • *Designed for use with stock dual-mass flywheel
  • 2004-2005 Subaru Baja Turbo

What's in the box?

  • 4228018 - 4 Pad Rigid Race Disc
  • AT90 - Alignment Tool
  • PB1004 - Pilot Bearing
  • RB601 - Release Bearing
  • SB018 - P/PL-M Heavy Duty Pressure Plate
  • Installation Instructions!

Specifications

  • Description: HD-M/Race Rigid 4 Pad
  • Torque Capacity (ft/lbs.): 550
  • Torque Capacity Over OE: 70%
  • Disc Type: Race Disc
  • Spline Count: 24
  • Spline Size (in.): 1
  • Disc Diameter (in.): 9
  • Disc Diameter (mm.): 228
  • Pressure Plate Type: Heavy Duty
  • Product Weight (lbs.): 14.8
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