The M50 nameplate was previously reserved for V8 models, but BMW felt this X3 deserved to ditch the ‘40i’ badge given the performance on offer. This is the most powerful current B58-powered ...

As the flagship grade, the M50 gains 21-inch alloy wheels, a superior stereo, quad exhaust tips, and the M Sport package that includes M-branded things like seat belts and brake calipers.