Spec Clutch SZ133F Stage 3 Plus Performance Clutch Kit

The SPEC SZ133F Stage 3+ Clutch Kit is SPEC's flagship performance clutch solution, engineered for high-powered street and race vehicles that demand a manageable, driver-friendly engagement without sacrificing torque capacity. Built around a carbon semi-metallic full-faced friction disc, the Stage 3+ delivers an exceptional combination of long service life, superior friction coefficient, and everyday drivability in a single complete package.

Unlike the puck-style Stage 3, the Stage 3+ uses a full-faced clutch disc for smoother, more progressive engagement — making it an ideal choice for drivers who need serious performance without the harshness of a pure race clutch. The hub is double-sprung with spring cover reliefs for added flexibility, and all hub components are heat-treated for maximum strength and long-term durability.

A high-clamp pressure plate provides the clamping force needed to handle aggressive power levels, while the included bearing and tool kit ensures a complete, straightforward installation. The SPEC Stage 3+ is versatile enough to perform across a wide range of driving disciplines.

Key Features:

• High-clamp pressure plate for increased torque holding capacity
• Carbon semi-metallic full-faced friction disc for superior life and drivability
• Double-sprung hub with spring cover reliefs for flexibility
• Heat-treated hub components for strength and durability
• High-torque sprung hub and disc assembly
• Includes release bearing and installation tool kit
• Made in the U.S.A.

Intended Use:

• Street Performance
• Drag Racing
• Autocross
• Road Racing
• Rally / Rallye
• Pulling
• Drift

SPEC clutches are manufactured to exceptionally tight tolerances using advanced production methods, making them a trusted choice for both competitive race teams and high-performance street builds alike.