Spec Clutch SF661-2 Stage Performance Clutch Kit - 1

The SPEC SF661-2 Stage 1 Clutch Kit is a high-performance organic clutch system engineered for drivers who demand reliable power transfer on the street and at the track. Built around a carbon Kevlar-based, integrally molded organic friction disc, this kit delivers smooth, confident engagement with exceptional service life — making it one of SPEC's most versatile performance clutch offerings.

The friction disc features an integrally bonded steel backing that reinforces the lining under high clamp loads and elevated temperatures, ensuring consistent performance across a wide range of demanding conditions. The hub is double-sprung with spring cover reliefs for added drivetrain flexibility, while heat-treated internal components provide long-term strength and durability.

SPEC clutches and flywheels are designed, hand-built, and tested in the USA under strict manufacturing tolerances, reflecting SPEC's commitment to quality and performance across thousands of applications.

Key Features:

• Carbon Kevlar-based organic friction disc — smooth engagement with long service life
• Integrally bonded steel-backed disc — resists high clamp loads and heat
• High-clamp performance pressure plate — increased torque holding capacity
• Double-sprung hub with spring cover reliefs — enhanced drivetrain flexibility
• Heat-treated hub components — added strength and durability
• Multi-compound woven organic disc material — balanced grip and wear characteristics
• Includes bearing and installation tool kit

Ideal Driving Applications:

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

The SPEC Stage 1 is best suited to naturally aspirated and mildly modified forced induction engines, offering stock-like pedal feel with meaningfully improved torque capacity — the ideal upgrade for enthusiasts seeking proven performance without sacrificing everyday drivability.