Spec Clutch ST423H Stage 2+ Performance Clutch Kit

The SPEC ST423H Stage 2+ Clutch Kit bridges the gap between the Stage 2 and Stage 3 performance clutch lines, delivering a meaningful torque capacity upgrade without sacrificing the street-friendly engagement feel that Stage 2 is known for. It is purpose-built for modified engines that have outgrown a standard Stage 2 clutch, offering a 15–20% higher torque capacity while maintaining excellent daily drivability.

At the heart of this kit is a full-faced, multi-friction composite disc featuring carbon semi-metallic material on one side and Kevlar® on the other — a combination engineered to deliver consistent bite, strong friction coefficients, and long-lasting wear characteristics across a wide range of driving conditions. The double-sprung hub incorporates spring cover reliefs for added flexibility, while heat-treated internal components ensure strength and durability under sustained high-load use.

Key Features:

• Full-faced multi-friction disc with carbon semi-metallic on one side and Kevlar® on the other
• 15–20% higher torque capacity vs. the standard Stage 2 clutch kit
• High-clamp performance pressure plate for increased clamping force
• Double-sprung hub with spring cover reliefs for smooth, flexible engagement
• Heat-treated hub components for long-term strength and durability
• Includes release bearing and alignment tool kit
• SFI approved

Ideal Driving Applications: Street, Drag Racing, Road Racing, Rally, Autocross, Pulling, and Drift

SPEC clutches are designed, hand-built, and tested in the U.S.A., and the ST423H is no exception — making it a trusted choice for performance enthusiasts who demand reliability and trackworthy performance from their drivetrain.