Spec Clutch SP903 Stage 3 Performance Clutch Kit Carbon Semi-Metallic 6-Puck

The SPEC SP903 Stage 3 Clutch Kit is engineered for heavily modified street and race engines that demand aggressive torque capacity without sacrificing daily drivability. This kit delivers a comfortable pedal feel, quick engagement, and strong wear characteristics under both low and high-stress driving conditions — making it one of the most versatile performance clutch upgrades available.

At the heart of this kit is SPEC's proven carbon semi-metallic 6-puck sprung hub disc, renowned for its industry-leading balance of drivability, service life, and torque capacity. The sprung hub is double-sprung with spring cover reliefs for maximum flexibility, while heat-treated internal components ensure long-term strength and durability under demanding use.

Key Features:

• High-clamp performance pressure plate for increased clamping force
• Carbon-graphite semi-metallic friction material for superior heat resistance and torque transfer
• 6-puck sprung hub disc assembly — 4-puck configuration available upon request
• Double-sprung hub with spring cover reliefs for smooth, flexible engagement
• Heat-treated components for enhanced durability and longevity
• Includes release bearing and installation tool kit
• Flywheel not included
• Disc diameter: 9.500 in. (241 mm)
• Input shaft diameter: 1.031 in. with 23-spline input

Recommended Driving Applications: Street, Drag Racing, Drift, Road Racing, Rallye, Pulling, Autocross

The SPEC Stage 3 sits within SPEC's full lineup of street/strip clutch stages (Stage 1 through Stage 3+), positioned as the ultimate street/strip solution before moving into dedicated race-only Stage 4 and Stage 5 kits. All SPEC clutch kits are designed, hand-built, and tested in the USA.