Spec Clutch SF603H Stage 2 Plus Performance Clutch Kit

The Spec Clutch SF603H Stage 2 Plus Clutch Kit bridges the gap between the Stage 2 and Stage 3 performance levels, delivering the smooth drivability and predictable engagement of a Stage 2 clutch while adding 15–20% more torque capacity. This makes it an ideal upgrade for performance street builds, track days, drag racing, autocross, rally, and pulling applications.

At the heart of the SF603H is a multi-friction disc in a full-faced configuration, combining carbon semi-metallic material on one side with Kevlar on the other. This hybrid friction pairing provides aggressive grip when needed while maintaining street-friendly engagement quality and extended disc life. The double-sprung hub features spring cover relieves for added flexibility, with heat-treated components throughout for long-term strength and durability under high-stress conditions.

Key Features:

• Hybrid friction disc — carbon semi-metallic and Kevlar full-faced configuration for balanced grip and longevity
• High-clamp pressure plate for increased clamping force and improved torque transfer
• 15–20% higher torque capacity compared to the Stage 2, without sacrificing street drivability
• Double-sprung hub assembly with spring cover relieves for flexibility and vibration management
• Heat-treated components for enhanced strength and thermal durability
• Bearing and tool kit included for a complete installation package

Suited for a wide range of driving disciplines including street, drag, autocross, road racing, rally, pulling, and drift, the SF603H Stage 2 Plus is engineered and hand-built in the U.S.A. to SPEC's exacting standards.