11,000 RPM Valve Spring Kit for BMW S54

5150 AutoSport Pro-Xtreme Valve Springs for BMW S54 Engines Maximize your engine’s potential with 5150 AutoSport Pro-Xtreme Valve Springs, designed for BMW S54 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 as a full kit—including valve springs, seats, and steel retainers—or springs only, giving you the flexibility to match your setup for optimal performance and reliability. Designed for Peak RPM Performance Proven in our very own shop E46 M3 turbo build, these valve springs effortlessly spun to 9,500 RPM under heavy load without skipping a beat. Perfect for high-lift cams and aggressive tunes, our 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, fo