Spec Clutch SN423H Stage 2 Plus Clutch Kit - Carbon Kevlar Multi-Friction

The Spec Clutch SN423H Stage 2 Plus Clutch Kit is engineered to bridge the gap between the Stage 2 and Stage 3 performance levels, delivering a 15–20% higher torque capacity than the standard Stage 2 — up to 263 ft-lbs — while maintaining the smooth, street-friendly engagement characteristics that make the Stage 2 so popular for daily driving.

At the core of this kit is a composite multi-friction disc in a full-faced configuration, combining carbon semi-metallic material on one side and Kevlar on the other. This hybrid friction material delivers confident grip under load while preserving excellent wear characteristics and pedal feel. The double-sprung hub features spring cover reliefs for added flexibility, and all hub components are heat-treated for long-term strength and durability under demanding conditions.

Kit Includes:

• High-clamp performance pressure plate
• Full-faced composite multi-friction disc (carbon semi-metallic / Kevlar)
• High-torque double-sprung hub and disc assembly
• Release bearing and installation tool kit

Key Features:

• 15–20% higher torque capacity over the standard Stage 2
• Full-faced carbon semi-metallic and Kevlar hybrid friction disc
• High-clamp pressure plate for increased clamping force
• Double-sprung hub with heat-treated components for strength and longevity
• SFI approved for added safety and confidence
• Suitable for street, drag, road race, rally, autocross, pulling, and drift applications

The SN423H is ideal for modified engines that have outgrown the standard Stage 2's torque capacity but don't require the aggressive engagement of a Stage 3. Whether you're running a built street car or a dedicated weekend warrior, the Stage 2 Plus delivers the torque handling you need without sacrificing daily drivability.