As you're well aware, M variants are different beasts from regular Bimmers. The M60i sort of blurs the line between them, for it packs an M-developed engine despite being an M Performance vehicle.

The mighty inline-6 (also known as a straight-six or I6) was once a common sight, powering any number of models from around the world. In the last few decades, however, the V6 has more or less ...