• ACT Extreme Race Sprung 4 Pad Clutch Kit | Subaru STI (04-21) (SB10-XTG4)
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ACT Extreme Race Sprung 4 Pad Clutch Kit | Subaru STI (04-21) (SB10-XTG4)

ACT Extreme Race Sprung 4 Pad Clutch Kit | Subaru STI (04-21) (SB10-XTG4)

SB10-XTG4

In stock

$869.00 USD
$1,073.00 USD $869.00 USD
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The ACT Extreme Race Sprung 4 Pad Clutch Kit for Subaru STI (2004-2021) is a high-performance clutch system designed for demanding driving conditions. Featuring an Xtreme pressure plate with an exclusive diaphragm design, this kit increases clamp load, reduces deflection, and maximizes clutch lifespan. The four-stage heat-treating process applied to all diaphragms ensures exceptional durability and heat resistance, making it suitable for aggressive street and track use. The 4-pad spring-centered race disc enhances engagement stability and power transfer, providing reliable performance under high torque loads. Constructed with precision cover stampings, the clutch components deliver rigidity and consistency for intense driving scenarios.

This clutch kit is specifically engineered for Subaru STI models from 2004 to 2021, compatible with various engine configurations within this range. It serves as a direct replacement for stock clutch systems, offering increased clamping force and durability for high-performance applications. The kit includes the sprung disc, pressure plate, and necessary hardware for installation, ensuring a straightforward upgrade process. Ideal for track days, spirited street driving, or racing, this clutch kit provides the reliability and performance needed to handle increased power levels and aggressive driving styles.

Overview

2004-2021 Subaru STI ACT Xtreme 4 Puck Sprung Disc Clutch Kit

SB10-XTG4 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 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.

Features

  • Torque Capacity (ft/lbs.): 755
  • Moderate to heavy pedal effort, aggressive engagement, OE to mild gear rattle, confidence during hard shifts
  • Moderate friction life, extended by ACT's exclusive diaphragm design, dramatic improvement in release mechanism life
  • 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 high horsepower street or race use

Benefits

  • Increase clamp load, reduce deflection and maximize clutch life
  • Reduced stress concentrations
  • Increase strength and reliability

Applications

  • 2004-2021 Subaru WRX STI
  • 2007-2009 Subaru Legacy GT spec.B*6 speed applications only - Must use ACT or factory flywheel for the 2004 and newer WRX STi

What's in the box?

  • 4240518 - 4 Pad Sprung 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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