Why a BMW N54 Turbo Rebuild Is Essential The BMW N54 engine, known for its smooth inline-six layout and twin turbochargers, is one of BMW’s most celebrated powerplants. Found in models like the 135i, 335i, 535i, Z4 35i, and early 1M prototypes, the N54 delivers exhilarating performance and impressive tuning potential. However, the turbochargers on […]