Well, if they go for the V6, its purely because the engine is more compact and would allow for more space, another point to keep in mind is the whole reason behind BMW's decision to build Straight six engines,this was because in N/A form it was easier to extract more Power by making use of its ability to rev higher than its V6 counterpart, due to it being less prone to vibration. Force-fed motors in general don't need to and rarely do rev very high in order to make power, so V6 or I6 would work equally well, this was proven when Nissan changed their prized GTR's power plant from I6 to V6, also now they can increase the capacity of the motor without having to worry about space. It worked out great for Nissan,So why not For BMW:thumbs: