Comp Clutch 04-20 Subaru STi Stage 4 – 6 Pad Ceramic Clutch Kit

Part Details:

The Competition Clutch Stage 4 – Strip Series 1620 Clutch Kit is designed for high-horsepower street/strip builds that require maximum holding power and consistent performance under hard launches. This assembly is rated for up to a 250% increase in torque capacity over the factory clutch, making it well suited for demanding applications where traction and drivetrain load are significantly higher than stock.

The 1620 Series pairs a performance pressure plate with a six-puck, high-torque sprung disc featuring ceramic button friction material. This combination delivers strong bite and excellent heat resistance for repeated high-load engagement.

Pressure Plate & Disc Design

The six-puck sprung disc is available with a double spring, six-rivet carriage design to improve strength and stability in higher horsepower applications. This construction helps provide smoother gear transitions and better durability compared to lighter-duty disc configurations.

Ceramic button friction material is engineered for aggressive engagement and high thermal capacity, making it a strong option for drag racing and hard-use performance driving where consistent holding power is critical.

Strip-Focused Engagement Characteristics

Engagement is quicker and more aggressive than Stage 2 and Stage 3 street-oriented clutch kits, with a more direct feel intended for performance use. While still manageable due to the sprung hub design, this clutch is best suited for experienced drivers and higher-power setups.

For best performance and service life, a proper break-in period is recommended before subjecting the clutch to repeated hard launches.

Kit Contents

• Performance pressure plate
• Six puck high-torque sprung disc with ceramic buttons
• All applicable release bearings
• Clutch alignment tool

Key Features

• Up to 250% increase in torque capacity over stock
• Six puck sprung disc with ceramic button friction material
• Double spring, six-rivet carriage design for higher horsepower applications
• Strong bite with high heat resistance for street/strip use
• Designed for hard launches and demanding driving conditions

Recommended Supporting Drivetrain Components

• Flywheels – commonly replaced during clutch installation to ensure proper engagement and compatibility.
• Transmission Mounts – help reduce drivetrain movement and improve shift consistency under load.
• Shifter Bushings – improve shift feel and precision, especially when paired with a performance clutch.
• Drivetrain Components – explore additional upgrades designed to support reliable power transfer.