BMW may begin straying from its long held tradition of equipping its M models with rev-happy, naturally aspirated engines ... the new M5, due out in 2011. The twin-turbo'd 3.0-liter inline ...

It's no surprise that BMW plans to attempt to bring its uber-saloon up to AMG-levels of power when the new M5 debuts in 2011 ... technology will be used on the engine, along with its Efficient ...

The S14 in the E30 M3 ... E60 generation M5. Yup, there have been some stunners (as well as the odd duffer) over the years. Despite its naturally aspirated engine roots BMW does have some form ...