BMW X3 M in works, powered by tri-turbo straight 6

BMW has an M treatment in the works for its mid-sized X3, according to a report by CAR Magazine. With the exception of the X1, all upcoming X models will have M division treatment available. This model is expected to hit the road as of early 2012.
Starting with the M3 motor, the BMW X3 M will be a modified version that could include some exciting new upgrades. BMW is working on taking forced induction where it has never been before with a tri-turbo in development. It is possible that the X3 M will debut with three turbochargers, including two exhaust-gas driven and one electric, paired with the straight six. To accommodate the changes displacement will increase from 3.0 to 3.2 liters. That should help it produce somewhere around  449-hp.
The X5 M and X6 M’s next generation will keep the twin-turbo 4.4 liter V8 engine, and gain 9-hp, bringing it up to 564-hp. Fuel efficiency will also be improved at up to a 15% increase.