The N55 launched in 2009, incorporating the latest technology at BMW, considered "state of the art" at the time. One of the most significant innovations was the engine's turbocharging, which no longer used the two turbochargers (Bi-Turbo) of the N54 but rather a single Twin-Scroll charger. Furthermore, the third generation of the Valvetronic system made its debut in the N55, which has become m...