Spec Clutch SN503F-2 Stage 3 Plus Performance Clutch Kit

The SPEC SN503F-2 Stage 3+ Clutch Kit is the flagship street/race clutch in the SPEC performance lineup, engineered for high-powered applications that demand strong torque capacity without sacrificing daily drivability. The Stage 3+ steps up from the standard Stage 3 with a full-faced carbon semi-metallic friction disc, delivering superior wear characteristics, a higher friction coefficient, and excellent engagement feel — all in a single kit.

The disc hub is double-sprung with spring cover reliefs, providing added flexibility under load, while heat-treated hub components ensure long-term strength and durability. A high-clamp pressure plate rounds out the assembly, maximizing clamping force for demanding performance use.

Key Features:

• Full-faced carbon semi-metallic friction material — unparalleled life, friction coefficient, and drivability
• High-clamp pressure plate for maximum torque holding capacity
• Double-sprung hub with spring cover reliefs for flexibility and vibration absorption
• Heat-treated hub components for enhanced strength and durability
• High-torque sprung hub and disc assembly
• Bearing and tool kit included
• SFI Approved

Ideal Driving Applications:

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

The SPEC Stage 3+ is recommended for street/strip use and represents the highest street-oriented stage before moving into SPEC's dedicated race-only Stage 4 and Stage 5 kits. It is the ideal choice for heavily modified engines producing torque levels beyond what the Stage 3 can support, while still maintaining manageable, friendly clutch engagement for street driving.