5150 Auto Sport Pro-Xtreme Valve Springs Kit BMW M50 / M52 Engines

Maximize your engine’s potential with 5150 Auto Sport Pro-Xtreme Valve Springs, designed for BMW M50 and M52 (also USA market S50/S52). 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.

Designed for Peak RPM Performance

Proven in 5150’s very own E36 M3 “Bully” build, these valve springs effortlessly spun to 9,500 RPM under heavy load without skipping a beat. Perfect for high-lift cams, big boost and aggressive tunes, the 5150 AutoSport Pro-Xtreme Valve Springs deliver flawless valve control, preventing float even at extreme RPMs.

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.

Note: Installation requires the expertise of a professional engine builder.

Learn more about 5150 AutoSport here.