2011 twin-turbo'd BMW M5 to produce 550 hp
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.
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