BMW M20 Pro-Xtreme Valve Spring Kit

5150 AutoSport Pro-Xtreme Valve Springs for BMW M20 engines: M20B20, M20B23, M20B25, and M20B27. 

Maximize your engine’s potential with 5150 AutoSport Pro-Xtreme Valve Springs, designed for BMW M20B23, M20B25, and M20B27 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.

Designed for Peak RPM Performance

Perfect for high-lift cams and aggressive tunes, 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.

Key Features:

• Capable of supporting engine speeds up to 11,000 RPM
• Tested and proven to handle 9,500 RPM in our E36 M3 "Bully" build
• Ideal for use with high-lift camshafts and aggressive tuning
• Engineered for BMW M20 engines

Note that installation requires the expertise of an engine builder.

BMW M20B20 Applications:

BMW 3 Series

1977-1982     E21     320 / 326
1982-1994     E30     320i

BMW 5 Series

1977-1981     E12     520 / 526
1981-1987     E28     520i

BMW 7 Series

1981-1987     E23     720i

BMW M20B23 Applications:

BMW 3 Series

1977-1982     E21     323i
1982-1994     E30     323i

BMW M20B25 Applications:

BMW 3 Series

1985-1993     E30     325i / 325is / 325ix

BMW 5 Series

1987-1990     E34     525i

BMW M20B27 Applications:

BMW 3 Series

1982-1987     E30     325e / 325es [North America]

BMW 5 Series

1982-1987     E28     525e / 528e