S54

A high-performance classic first introduced in the E46 M3 and later used in the Z3 and Z4 M models. This inline-six engine is known for its impressive power output, smooth operation, and reliability. It features individual throttle bodies, VANOS variable valve timing, and a high compression ratio, making it a popular choice for performance-built cars. With its high-revving nature and potential for aftermarket modifications, the S54 has become a favorite among enthusiasts looking to build powerful and responsive BMW track or race cars.