Spec Clutch N444SA Stage 4 Clutch Kit with Billet Aluminum Flywheel

The Spec Clutch N444SA is a Stage 4 race-grade clutch kit paired with a billet aluminum flywheel, engineered for Nissan applications demanding maximum holding power and durability. As a solid-hub design derived from the Stage 3 platform, the Stage 4 steps up performance for serious motorsport use.

Key Features:

• Solid 8-rivet hub construction for maximum strength under race conditions
• Heat-treated assembly for enhanced durability and long service life
• 4-puck disc configuration — a balanced compromise between the lightweight 3-puck and the smoother 6-puck engagement
• Billet aluminum flywheel included (SA designation) — reduces rotating mass for quicker revs and improved throttle response
• SFI approved clutch kit and flywheel
• Available puck options (3, 4, or 6) allow tuning for specific use cases: 3-puck for lightest weight, 6-puck for smoothest engagement

The Stage 4 is purpose-built for drag racing, road racing, rallye, pulling, and drift applications. Due to the rigid solid hub design, this kit is not recommended for daily street driving. Stages 4 and 5 are classified as race-only by SPEC.

Installation Note: Unless installing a new SPEC flywheel, the existing flywheel must be resurfaced prior to installation. A proper break-in period of at least 450 miles of primarily city/stop-and-go driving is required before full-throttle engagement or race launching.