SPEC Stage 4 Clutch Kit

2007–2010 Scion tC / 2008–2015 Scion xB2

ST163F

Overview:

The SPEC Stage 4 Clutch Kit is a high-performance upgrade designed specifically for the 2007–2010 Scion tC and 2008–2015 Scion xB2 models. Engineered for enthusiasts seeking maximum torque capacity and durability, this clutch kit is ideal for aggressive street driving, drag racing, road racing, rally, and drifting applications. It features a solid hub design that enhances strength and reliability compared to the Stage 3 version, making it a robust choice for high-stress driving conditions.

With a torque capacity of 480 ft/lbs, the Stage 4 kit delivers exceptional holding power while maintaining street drivability in its 6-puck configuration. Whether you prioritize quick engagement or smooth operation, the available puck configurations allow you to tailor the clutch to your driving style and performance needs.

Key Features:

This clutch kit combines advanced materials and engineering to provide superior performance and longevity. Key features include:

• Solid 8-rivet hub design for enhanced strength and durability
• Heat-treated assembly to withstand high temperatures and stress
• High clamp pressure pressure plate for improved torque capacity
• Carbon-Graphite friction material for consistent engagement and long life
• High torque sprung hub and disc assembly to reduce drivetrain shock
• Available in 3, 4, or 6 puck configurations to suit different driving preferences
• Includes bearing and tool kit on select models (please inquire)
• Torque capacity rated at 480 ft/lbs

Configuration Options

The SPEC Stage 4 Clutch Kit offers multiple puck configurations to balance engagement feel and drivability:

• 3-puck: Lightest option with quick engagement, ideal for racing applications where rapid clutch response is critical.
• 4-puck: A balanced choice offering a compromise between smoothness and aggressive engagement.
• 6-puck: Smoothest engagement and street-friendly option, though the rigid hub design may still feel firm for daily driving.

Construction & Design:

The Stage 4 clutch kit is built with a solid hub featuring eight rivets, significantly increasing the assembly’s structural integrity over previous stages. The entire clutch assembly undergoes heat treatment to enhance strength and durability, ensuring it can handle the rigors of high-performance driving. The carbon-graphite friction material provides excellent heat resistance and consistent engagement, reducing fade during extended use. The sprung hub design helps absorb drivetrain shocks, improving overall drivability and component longevity.

Installation & Fitment:

This clutch kit is a direct fit replacement for the 2007–2010 Scion tC and 2008–2015 Scion xB2 models. Installation requires standard clutch replacement procedures and may involve minor adjustments depending on the puck configuration chosen. Due to the solid hub design, the Stage 4 clutch is less forgiving than stock or lower-stage clutches, so professional installation and proper break-in are recommended to ensure optimal performance and longevity.

What's Included:

• SPEC Stage 4 Clutch Disc (3, 4, or 6 puck configuration)
• High clamp pressure pressure plate
• Sprung hub assembly
• Bearing and tool kit (included on select models, please inquire)
• Installation instructions

Ideal For:

The SPEC Stage 4 Clutch Kit is perfect for performance enthusiasts who demand a durable, high-torque clutch capable of handling aggressive driving styles. It excels in drag racing, road racing, rally, pulling, and drifting scenarios where clutch engagement precision and strength are critical. While the 6-puck version remains street drivable, this clutch is best suited for drivers who prioritize performance over everyday comfort due to its rigid solid hub design.

SPEC delivers clutches and drivetrain components. With an emphasis on power transfer and drivability, their products help performance cars put power down cleanly—whether you’re upgrading a daily driver, building for track days, or supporting added torque. SPEC is a solid choice when engagement, durability, and consistent performance matter.