Spec Clutch SO133F Stage 3 Plus Performance Clutch Kit

The Spec Clutch SO133F Stage 3+ Clutch Kit is the flagship single-disc performance clutch for heavily modified street and race vehicles that demand maximum torque capacity without sacrificing daily drivability. Engineered as a step above the Stage 3, this kit delivers superior holding power alongside more manageable engagement and outstanding wear characteristics.

At its core, the Stage 3+ uses a full-faced carbon semi-metallic friction disc that delivers an exceptional combination of long service life, high friction coefficient, and street-friendly drivability in a single package. The hub is double-sprung with spring cover reliefs for added flexibility and reduced drivetrain shock, while all hub components are heat-treated for enhanced strength and long-term durability.

Kit Includes:

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

Ideal Driving Applications:

• Street / Daily Driving
• Drag Racing
• Drifting
• Road Racing
• Autocross
• Rallye
• Pulling

All Spec Clutch products are designed, hand-built, and tested in the U.S.A., and every clutch kit and flywheel in the Spec lineup is SFI approved. The Stage 3+ is recommended for street and strip applications and is positioned as Spec's highest-performing street-legal single-disc solution before stepping into dedicated race-only Stage 4 and 5 kits.