Spec Clutch SM513H Stage 2 Plus Performance Clutch Kit

The Spec Clutch SM513H Stage 2 Plus Clutch Kit is engineered for modified engines that demand more holding power than a standard Stage 2 clutch can deliver. Bridging the gap between the Stage 2 and Stage 3, this kit provides a 15–20% higher torque capacity while preserving the smooth, street-friendly engagement feel that makes the Stage 2 line a favorite among performance drivers.

At the core of the Stage 2 Plus is a composite multi-friction disc in a full-faced configuration, featuring carbon semi-metallic material on one side and Kevlar on the other. This hybrid friction combination delivers excellent wear characteristics alongside the added torque capacity needed for high-output builds. The hub is double-sprung with spring cover reliefs for added flexibility, and heat-treated components throughout ensure long-term strength and durability under demanding conditions.

Key Features:

• High-clamp pressure plate for increased clamping force
• Hybrid carbon-graphite and Kevlar friction disc — full-faced configuration
• Double-sprung hub with spring cover reliefs for smooth, flexible engagement
• Heat-treated components for enhanced strength and durability
• High-torque sprung hub and disc assembly
• Bearing and tool kit included
• Designed and hand-built in the USA

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

The SM513H is the ideal upgrade for drivers who have outgrown a Stage 2 but want to retain daily-drivable clutch feel without stepping up to the more aggressive Stage 3 engagement characteristics.