Spec Clutch SN503F Stage 3 Plus Performance Clutch Kit

The SPEC SN503F Stage 3+ Clutch Kit is the flagship performance clutch for heavily modified street and race engines that demand more torque capacity than the standard Stage 3 can support. Engineered as the ultimate street/strip solution, the Stage 3+ delivers a manageable, friendly engagement feel without sacrificing the high-torque holding power serious builds require.

Unlike traditional puck-style race clutches, the Stage 3+ uses a full-faced carbon semi-metallic friction disc that dramatically reduces the harsh on/off engagement feel, making it genuinely drivable on the street while still performing on the strip, drag pad, or road course. The double-sprung hub features spring cover reliefs for enhanced flexibility, and all hub components are heat-treated for long-term strength and durability.

Key Features:

• High-clamp pressure plate for maximum torque transfer under aggressive driving conditions
• Full-faced carbon semi-metallic friction disc for superior life, friction coefficient, and daily drivability in one package
• Double-sprung hub with spring cover reliefs for smooth engagement and flexibility
• Heat-treated hub components for strength and long-term durability
• High-torque sprung hub and disc assembly engineered for high-output applications
• Bearing and tool kit included for a complete installation-ready package

Intended Use: Street, Drag Racing, Drift, Road Racing, Autocross, Rally, Pulling

The SPEC Stage 3+ is the top street-oriented stage in the SPEC clutch lineup — ideal for forced induction, heavily built engines, or any application that has outgrown the Stage 3 but still requires reliable, daily-driven engagement characteristics.