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. That means that output needs to surpass the current model's paltry 501 hp, so BMW will bore out the current V10 to 5.5-liters, slap on a couple of turbos and use direct-injection to bringing power levels up to 550 hp, or more. Grunt will be shoveled to the rear wheels via either a six-speed manual transmission or the new seven-speed M DCT dual-clutch 'box.

But it's not all about pavement-pummeling power. The use of the twin-turbochargers and DI is as much an attempt to reduce emissions as it is to boost output, and BMW is intent on making the next 5-series, due out in 2010, one of its most fuel-efficient vehicles. That means that start-stop technology will be used on the engine, along with its Efficient Dynamics system that uses regenerative braking to reduce load on the alternator, improving both fuel economy and engine output.

[Source: Autocar]