Spec Clutch SB554-2 Stage 4 Performance Clutch Kit BMW 335i 435i

The Spec Clutch SB554-2 is a high-performance Stage 4 clutch kit engineered for serious racing applications in 2012-2017 BMW 335i and 2013-2017 BMW 435i models equipped with N55 engines. This professional-grade clutch kit is designed for drag racing and road racing purposes where maximum holding power and instantaneous engagement are required.

Performance Specifications:

• Torque capacity: 580 lb-ft at the flywheel
• High clamp pressure plate for maximum clamping force
• Choice of 3, 4, or 6-puck carbon semi-metallic rigid disc configuration
• High torque rigid hub with 8-rivet carrier assembly
• Heat-treated components for exceptional strength and durability
• Includes clutch alignment tool and installation hardware

Important Installation Notes:

• Designed exclusively for use with SPEC billet flywheels (SB55S-2 or SB55A-2)
• Utilizes concentric hydraulic slave/bearing assembly (not conventional throwout bearing)
• Requires flywheel resurfacing prior to installation unless using new SPEC flywheel
• Minimum 450-mile break-in period required for optimal performance

This Stage 4 clutch features instantaneous engagement characteristics and is not recommended for daily street driving. The solid hub design eliminates driveline cushion for maximum power transfer, making it ideal for dedicated race vehicles and serious motorsports competitors who demand uncompromising performance and reliability.