Spec Clutch ST514 Stage 4 Performance Clutch Kit - Carbon Semi-Metallic

The Spec Clutch ST514 Stage 4 Clutch Kit is a high-performance, solid-hub clutch system engineered for heavily modified engines where maximum torque capacity, instantaneous engagement, and reduced rotating mass are critical. This is a race-focused clutch designed for drivers who demand aggressive performance over everyday street comfort.

The Stage 4 is a solid-hub evolution of the Stage 3 design, replacing the sprung hub with a rigid 8-rivet solid hub assembly that is heat-treated for superior strength and durability under extreme conditions. The high-clamp pressure plate works in conjunction with carbon semi-metallic friction material to deliver firm, consistent clamping force under race loads.

Puck Configuration Options:

• 3-Puck: Lightest rotating mass — ideal for maximum acceleration response
• 4-Puck: Balanced compromise between engagement feel and weight
• 6-Puck: Smoothest engagement of the three configurations; marginally more street-tolerant

Kit Includes:

• High-clamp performance pressure plate
• Carbon semi-metallic friction disc (3, 4, or 6-puck solid hub)
• High-torque rigid hub and carrier assembly
• Release bearing
• Installation tool kit

Intended Motorsport Applications: Drag Racing, Drifting, Road Racing, Rally, Pulling, Circle Track

Note: Due to the rigid hub design, the Stage 4 is not recommended for street use. Expect harsh, abrupt engagement characteristics typical of a competition-grade clutch.