• ACT Extreme Race Rigid 4 Pad Solid Disc Clutch Kit | Subaru STI (04-21) (SB10-XTR4)
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ACT Extreme Race Rigid 4 Pad Solid Disc Clutch Kit | Subaru STI (04-21) (SB10-XTR4)

ACT Extreme Race Rigid 4 Pad Solid Disc Clutch Kit | Subaru STI (04-21) (SB10-XTR4)

SB10-XTR4

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$823.00 USD
$1,016.00 USD $823.00 USD
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The ACT Extreme Race Rigid 4 Pad Solid Disc Clutch Kit for Subaru STI (2004-2021) is a high-performance clutch system designed for demanding driving conditions. Featuring an ACT Xtreme pressure plate, this kit provides increased clamp load, reduced deflection, and enhanced durability, making it ideal for aggressive street and track use. The pressure plate employs an exclusive diaphragm design that undergoes a four-stage heat-treating process, ensuring maximum performance and longevity. The high-quality ceramic 4-pad rigid race discs deliver superior grip and consistent engagement, supporting high horsepower and torque applications. Constructed with precision cover stampings, the clutch components offer rigidity and stability under intense loads, making this kit a reliable upgrade for serious enthusiasts.

Designed for 2004-2021 Subaru WRX STI models, this clutch kit is a direct replacement for stock components, providing improved performance without sacrificing reliability. It is suitable for street, track, and performance driving, offering a robust solution for drivers seeking increased holding capacity and durability. The kit includes all necessary components for installation, ensuring a straightforward upgrade process. Compatible with stock or modified engines, this clutch system enhances power transfer and pedal feel, making it an excellent choice for high-performance applications on Subaru STI vehicles.

Overview

2004-2021 Subaru WRX STI ACT XACT Streetlite Flywheel

SB10-XTR4 kit features an Xtreme pressure plate for the most demanding driver. ACT Xtreme 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

  • Moderate to heavy 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
  • 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability, includes ACT's patented Monoloc
  • Recommended for race use only

Benefits

  • Allows for quicker shifts and smooth, trouble-free service
  • Carefully calculated and tested for optimal performance
  • Heat-treated for strength and durability

Applications

  • 2004-2021 Subaru WRX STI
  • 2007-2009 Subaru Legacy GT spec.B(See * Below)
  • *6-Speed Only - Must use ACT or factory flywheel for the 2004 and newer WRX STi

What's in the box?

  • 4240018 - 4 Pad Rigid Race Disc
  • AT90 - Alignment Tool
  • PB1004 - Pilot Bearing
  • RB601 - Release Bearing
  • SB019X - P/PL-M Xtreme Pressure Plate
  • ACT's patented Monoloc
  • Installation Instructions!
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