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ACT Heavy Duty 6-Puck Disc Clutch Kit 2002-2005 WRX - SB9-HDG6 - Subimods.com

ACT Heavy Duty Sprung 6-Puck Disc Clutch 2002-2005 WRX / 2004-2005 Forester XT / 2007-2009 Legacy GT Spec. B

$795.00
$981.00
$981.00 - $981.00
$981.00
$795.00 - $795.00
$795.00
-19% -19%
7 In Stock, Usually Ships within 1-2 Business Days
SKU SB9-HDG6
by ACT
Lease to own Pay as low as $/week

DETAILS

The ACT SB9-HDG6 kit features ACT’s proven Heavy Duty pressure plate, engineered for increased clamp load, reduced deflection, and maximum clutch life. Each diaphragm spring undergoes ACT’s exclusive four-stage heat-treating process for consistent performance and durability, while precision cover stampings ensure rigidity and reliability.

The 6-pad, spring-centered race disc uses a spring-center construction that effectively dampens torsional vibrations and resists failure under high-stress conditions. Reinforced spring retainers with wraparound windows and thicker stampings improve strength and longevity. This configuration provides faster shifting and improved heat dissipation, though with a more aggressive engagement feel — ideal for high-power street or race setups.

The included Monoloc upgrade replaces the standard two-piece wedge collar and wire ring found in pull-type clutches. Its hardened chrome-moly steel construction and carefully tuned retaining ring deliver uniform bearing load and improved alignment under demanding conditions, greatly extending the life of the release mechanism.

Specs

  • Torque Capacity: 555 ft-lbs (63% over OE)
  • Disc Material: Ceramic
  • Disc Diameter: 9 in / 228 mm
  • Input Shaft: 1 in (24 spline)
  • Pressure Plate Type: Heavy Duty
  • Weight: 16.7 lbs

Performance Characteristics

  • Feel: Light to moderate pedal effort, aggressive engagement, OE to mild gear rattle, confident shifting under load
  • Life: Moderate friction life extended by ACT’s diaphragm design and Monoloc mechanism durability
  • Quality: Precisely engineered and balanced, using premium ceramic friction materials for superior heat tolerance and performance
  • Recommended Use: High-horsepower street or race applications
  • ACT Difference: Every unit is 100% clamp load tested and dynamically balanced for smooth, reliable operation at high RPM — now featuring ACT’s patented Monoloc for enhanced release performance
Which Clutch Kit is Right for Me: HD or XT? 

The choice between an HD (Heavy Duty) and XT (Xtreme Duty) clutch depends on your power level and driving style. The HD clutch is ideal for daily drivers and street-focused builds, offering a 20-50% increase in clamping force while maintaining smooth engagement and drivability. It is best suited for vehicles with mild to moderate performance upgrades that see a mix of city driving and occasional track use. On the other hand, the XT clutch is designed for high-performance applications, providing up to a 150% increase in clamping force with a more aggressive engagement. This makes it the preferred choice for heavily modified vehicles, track-focused builds, and those requiring maximum durability and grip. If you prioritize comfort and versatility, the HD clutch is the better option, while the XT clutch is the right choice for extreme performance and aggressive driving.

What’s the Difference Between a Full-Face Disc and a Pucked Clutch? 

Choosing between a full-face organic disc and a pucked cerametallic disc depends on your driving habits and performance needs. A full-face organic disc is best suited for daily driving and mild performance upgrades, offering smooth engagement, longevity, and quiet operation, making it ideal for street-focused vehicles with basic modifications. In contrast, a pucked cerametallic disc is designed for high-performance applications, featuring quick engagement, superior heat resistance, and higher torque capacity. This makes it the go-to option for racing, drifting, and vehicles with significant power upgrades. If you prioritize comfort and seamless engagement for daily use, the full-face organic disc is the right choice. However, if you need rapid engagement and superior performance under extreme conditions, a pucked clutch is the better option.

When Should I Choose a Single Disc Over a Twin Disc Clutch? 

The decision between a single disc and twin disc clutch depends on your vehicle’s power level and intended use. A single disc clutch is best for daily drivers and vehicles with moderate performance upgrades, handling up to 400-600 FT-LB of torque. It provides smooth engagement, an OEM-like pedal feel, and cost-effective performance, making it a great choice for street use with bolt-on modifications like intakes, exhausts, and tuning. Conversely, a twin disc clutch is ideal for high-performance builds exceeding 600 FT-LB of torque, offering superior heat dissipation, higher torque capacity, and faster shifts. This makes it the preferred option for competitive motorsports, aggressive driving, and vehicles requiring extreme torque handling. If you want a balance of affordability and daily drivability, a single disc clutch is the way to go, whereas a twin disc clutch is essential for high-power builds and track-ready performance.

How Do I Decide Between a Prolite and Streetlite Flywheel? 

The choice between a Prolite and Streetlite flywheel depends on your driving style and vehicle modifications. The Streetlite flywheel is designed for daily drivers and street builds, featuring slightly more mass to improve drivability, smooth engagement, and better heat dissipation. This makes it a great option for vehicles that see a mix of city driving and occasional track days. In contrast, the Prolite flywheel is engineered for racing and aggressive performance, offering a lightweight design that reduces mass for quicker revs, sharper throttle response, and faster shifts. This makes it ideal for high-horsepower or lightweight builds focused on track performance. If you need a flywheel that balances comfort and performance for versatile driving, the Streetlite flywheel is the better choice. However, if you prioritize ultimate responsiveness and fast acceleration, the Prolite flywheel is the superior option.

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ACT Single Disc Clutch Kits

ACT Single Disc Clutch Kits

ACT Single Disc Clutch Kits are designed to deliver exceptional performance and reliability, with every kit being a newly manufactured unit rather than a rebuilt product. ACT engineers each application from the ground up, developing innovative diaphragms and pressure plate faces to ensure superior quality. With up to 28 different pressure plate and disc combinations available, these kits cater to a wide range of needs, from mild street driving to full track use. Offering torque holding capacity increases ranging from 20% to an impressive 400%, most kits also meet the rigorous SFI Spec 1.1 standards, making them a top choice for performance enthusiasts.

DESIGN AND ENGINEERING

DESIGN AND ENGINEERING

Advanced Clutch Technology designs, engineers and develops products by leveraging decades of track and performance street experience. Advanced CAD, FEA simulation and CAM tools help ensure highly optimized performance, reliability and repeatability. These key advantages are produced by combining the best engineering and design methodologies with the latest in materials and manufacturing techniques.

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