2011 BMW M5

BMW CEO Norbert Reithofer has previously revealed that future BMW powertrains will be downsized in an effort to improve fuel-efficiency and reduce emissions--and that even the hallowed ‘M’ division would be affected by the new wave of environmental consciousness sweeping the automaker. BMW has always stood by the high-rev philosophy for delivering power from its M engines but all that is changing. We’ve already seen the potential of a twin-turbocharged V-8 engine in the X5 M and X6 M performance SUVs, and according to a new report the same force-fed engine is destined for...