BMW M40/M42/M44 Valve Spring Kit, Pro Xtreme

5150 AutoSport Pro-Xtreme Valve Springs for BMW M40 / M42 / M44 Engines

Maximize your engine’s potential with 5150 AutoSport Pro-Xtreme Valve Springs, designed for BMW M40 / M42 / M44 Engines. Whether you're building for high-revving street performance or all-out racing, these valve springs are built to handle engine speeds of up to 11,000 RPM with confidence. Available in two kit options—one for 6mm valves and one for 7mm valves—you get the flexibility to match your setup for optimal performance and reliability.

Precision-Engineered for High-Performance Builds

These springs are carefully designed to handle the demands of track-focused applications, forced induction setups, and naturally aspirated builds tuned for high RPMs. They offer consistent performance, ensuring your engine runs smoothly under extreme conditions, whether you're racing on the track or pushing your limits on the street.

Key Features:

• Available for 6mm and 7mm valves to fit your specific application
• Capable of supporting engine speeds up to 11,000 RPM
• Tested and proven to handle 9,500 RPM 
• Ideal for use with high-lift camshafts and aggressive tuning
• Engineered for BMW M40 / M42 / M44 Engines