Spec Clutch SZ404 Stage 4 Performance Clutch Kit - Carbon Semi-Metallic Puck

The Spec Clutch SZ404 Stage 4 Clutch Kit is a high-performance racing clutch engineered for heavily modified engines that demand maximum torque transfer and instantaneous engagement. Built as a solid hub evolution of the Stage 3, this kit is purpose-designed for motorsport and competition use where clutch durability and aggressive power delivery are the priority.

At the heart of the Stage 4 is a solid 8-rivet hub with a heat-treated assembly for exceptional strength and long-term durability under extreme load cycles. The carbon semi-metallic puck friction disc is available in 3, 4, or 6 puck configurations to suit your specific application: choose the 3-puck for the lightest rotating mass, the 6-puck for the smoothest engagement among puck options, or the 4-puck as the ideal balance of both.

While the 6-puck configuration is marginally street-drivable, the rigid hub design means this kit is not recommended for daily street use. It is best suited for dedicated performance and competition builds.

Key Features:

• Solid 8-rivet hub design — a rigid, race-focused evolution of the Stage 3
• Heat-treated hub assembly for maximum strength and durability
• Carbon semi-metallic friction disc in 3, 4, or 6 puck configuration
• High clamp pressure plate for superior torque holding capacity
• Includes bearing and tool kit
• High torque rigid hub and carrier assembly

Recommended Applications:

• Drag Racing
• Road Racing
• Rallye
• Drift
• Pulling
• Circle Track

The SPEC Stage 4 clutch kit delivers the aggressive engagement and high torque capacity demanded by serious competition builds. Pair with a SPEC flywheel for a complete drivetrain upgrade.