A further clue to this mule being a high-performance version was the sound of the engine. The photographer claimed it sounded very different to any of the X5's current powerplants, suggesting that it could be a new V10 version or possibly a twin-turbo V8 set-up. The final giveaway is the prototype's performance tires, signalling that we may have a new M car on the way.
We can picture the purists around the world shedding a tear at the thought of BMW adding an M badge to an SUV but if Porsche can get away with selling a sports off-roader, and AMG can pump up the Mercedes M-Class than we suppose BMW could too.
[Source: World Car Fans]