The BMW X4 has been reviewed as "A Compact SUV Rocket" by Car and Driver. This sporty SUV is not your ordinary utility vehicle. The X4 M is driven by the most powerful 6 cylinder engine that BMW has ever produced. Choose from either the non-competition or competition model and wither the 473 HP model or 503 HP beast. This is a drivers car. Purely a masterpiece by the german powerhouse. The BMW X4 M ranks right up there with the Porsche Macan Turbo and the Alfa Romeo Stelvio Quadrifoglio.