Spec Clutch ST554 Stage 4 Performance Clutch Kit

The SPEC ST554 Stage 4 Clutch Kit is engineered for heavily modified, high-performance vehicles where maximum torque capacity, instantaneous engagement, and reduced rotating mass are the top priorities. This is a dedicated competition clutch kit — not intended for street use — and is best suited for drivers who demand uncompromising performance on the track.

The Stage 4 builds on the Stage 3 platform with a high-clamp performance pressure plate paired with a carbon semi-metallic friction disc available in 3, 4, or 6 puck configurations. The disc uses a rigid (solid) hub and carrier assembly, delivering the direct, aggressive engagement characteristics required in motorsport applications. Due to the rigid hub design, expect harsh engagement behavior — this is by design for racing, not daily driving.

Kit Includes:

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

Recommended Driving Applications:

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

SPEC clutches are designed, hand-built, and tested in the USA. Prior to installation, the flywheel must be resurfaced (unless using a new SPEC flywheel), and a minimum 450-mile break-in period of primarily city/stop-and-go driving is required before full-throttle engagement or drag launching.