Spec Clutch ST913H Stage 2 Plus Performance Clutch Kit

The SPEC ST913H Stage 2 Plus Clutch Kit is engineered for drivers who demand more than a standard Stage 2 can deliver without sacrificing everyday street manners. This kit bridges the gap between Stage 2 and Stage 3 by featuring a multi-friction disc in a full-faced configuration — carbon semi-metallic on one side and Kevlar on the other — delivering a 15–20% higher torque capacity while retaining the smooth drivability and engagement quality SPEC Stage 2 clutches are known for.

The hub is double-sprung with spring cover reliefs for added flexibility under load, and all internal components are heat-treated for long-term strength and durability. The included high-clamp pressure plate maximizes clamping force to handle increased power demands across a wide range of driving environments.

Key Features:

• Multi-friction disc — carbon semi-metallic on one side, Kevlar on the other, full-faced configuration
• 15–20% higher torque capacity over the Stage 2
• High-clamp pressure plate for maximum holding power
• Double-sprung hub with spring cover reliefs for flexibility
• Heat-treated components for strength and durability
• Includes bearing and tool kit
• SFI approved — designed, hand-built, and tested in the USA

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

Installation Note: Unless installing a new SPEC flywheel, the existing flywheel must be resurfaced prior to installation to ensure proper friction surface integrity.