CAR states that the X3 M will likely be powered by a tweaked version of the new six-cylinder engine bound for duty in the M3. In the X3, this engine will reportedly produce somewhere around 450 horsepower, and could use a brand new tri-turbo system – one electric turbocharger paired with two exhaust-gas-driven units.
A 450-horsepower X3? With three turbochargers (one of which is electric)? Sounds absurd (and is to be taken with a grain of salt... for now), but based on our experiences with the rest of BMW's M range, consider us totally stoked.