Spec Clutch SJ403F Stage 3 Plus Carbon Semi-Metallic Clutch Kit

The SPEC SJ403F Stage 3 Plus Clutch Kit is the flagship performance clutch solution for high-powered street and competition vehicles that demand strong torque capacity without sacrificing drivability. Featuring a carbon semi-metallic full-face friction disc, this kit delivers an exceptional combination of long service life, high friction coefficient, and smooth, manageable engagement — all in a single complete package.

The disc hub is double-sprung with spring cover reliefs to absorb drivetrain shock and improve pedal feel, while heat-treated internal components provide the strength and durability needed for demanding use. A high-clamp pressure plate maximizes clamping force to handle elevated torque loads without slip.

Key Features:

• High-clamp pressure plate for maximum torque holding capacity
• Carbon semi-metallic full-face friction material for superior life and friction coefficient
• Double-sprung hub with spring cover reliefs for smooth, flexible engagement
• Heat-treated hub components for long-term strength and durability
• High-torque sprung hub and disc assembly
• Includes release bearing and installation tool kit

Ideal Applications:

• Street performance
• Drag racing
• Pulling
• Autocross
• Road racing
• Rally
• Drift

The SPEC Stage 3 Plus kit ships as a complete assembly, including all components needed for installation, making it an ideal upgrade for performance builds requiring a street-friendly yet race-capable clutch system.