Spec Clutch SM513F Stage 3 Plus High-Performance Clutch Kit

The SPEC SM513F Stage 3 Plus Clutch Kit is SPEC's flagship street and race clutch solution, engineered for heavily modified engines that demand torque capacity beyond what the standard Stage 3 can support. Designed to deliver a manageable, friendly engagement without sacrificing holding power, the Stage 3 Plus strikes the ideal balance between aggressive performance and daily drivability.

At the heart of this kit is a full-faced carbon semi-metallic friction disc, which provides unparalleled friction coefficient, service life, and drivability characteristics in a single package — a significant upgrade over the puck-style disc found in the Stage 3. The high-clamp pressure plate delivers the clamping force needed for high-torque applications, while the high-torque sprung hub assembly features double-sprung construction with spring cover reliefs for drivetrain flexibility and heat-treated components for long-term strength and durability.

Key Features:

• High-clamp performance pressure plate for maximum torque transfer
• Full-faced carbon semi-metallic friction material for superior life and drivability
• Double-sprung hub with spring cover reliefs for drivetrain flexibility
• Heat-treated hub components for strength and durability
• Includes release bearing and alignment tool kit
• SFI approved
• Designed and manufactured in the USA

Ideal Driving Applications: Street, Drag Racing, Drifting, Road Racing, Autocross, Rallye, Pulling

The SPEC SM513F Stage 3 Plus is the go-to choice for performance enthusiasts who need a clutch that handles serious power while remaining streetable and manageable for everyday use.