Spec Clutch SB813F Stage 3 Plus Clutch Kit

The SPEC SB813F Stage 3 Plus Clutch Kit is the flagship performance clutch solution for heavily modified street and race engines that have exceeded the torque limits of a standard Stage 3 setup. Engineered to deliver maximum torque capacity while maintaining a manageable, street-friendly engagement feel, the Stage 3+ is the go-to choice for high-powered builds that demand both reliability and drivability.

At the heart of this kit is a carbon semi-metallic full-faced friction disc, which delivers an outstanding combination of friction coefficient, service life, and drivability in a single package — outperforming traditional puck-style discs in everyday and track use alike. The hub features a double-sprung design with spring cover reliefs for added flexibility under load, paired with heat-treated components throughout for long-term strength and durability.

Kit Contents:

• High-clamp pressure plate
• Full-faced carbon semi-metallic friction disc
• High-torque double-sprung hub and disc assembly
• Release bearing
• Installation tool kit

Intended Use:

• Street performance
• Drag racing
• Drifting
• Road racing
• Pulling
• Autocross and Rally

The SPEC Stage 3 Plus delivers superior wear characteristics and a more manageable pedal feel compared to the Stage 3, making it the preferred upgrade for drivers who need race-level torque capacity without sacrificing daily drivability.