Spec Clutch SN444 Stage 4 Race Clutch Kit - Carbon Semi-Metallic Puck Disc

The Spec Clutch SN444 Stage 4 Clutch Kit is a high-performance, race-focused clutch system engineered for heavily modified engines that demand maximum torque capacity and instantaneous engagement. Rated up to 515 ft-lbs of torque, this kit is purpose-built for competition use and is classified as a race-only clutch system.

The Stage 4 is a solid hub evolution of the Stage 3. Unlike the sprung hub found in the Stage 3, the Stage 4 features a solid 8-rivet hub with a heat-treated assembly for exceptional strength and durability under extreme race conditions. The rigid hub design delivers the instantaneous, aggressive engagement required in high-demand motorsport environments.

Available Puck Configurations:

• 3-Puck: The lightest configuration — ideal for applications where rotational mass reduction is the top priority
• 4-Puck: A balanced compromise between weight savings and engagement smoothness
• 6-Puck: The smoothest engagement of the three; technically street-drivable, though not street-friendly due to the rigid hub design

Kit Includes:

• High-clamp pressure plate
• Carbon semi-metallic puck friction disc (3, 4, or 6 puck — configuration dependent)
• Solid 8-rivet rigid hub and carrier assembly
• Release bearing
• Installation tool kit

Intended Driving Applications:

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

Important Note: The Stage 4 is a race-only clutch. Due to the rigid hub design and aggressive engagement characteristics, it is not suitable for daily street driving. SPEC Clutch recommends Stages 1–3+ for street/strip applications.