Headlines: 2012 BMW M5 Concept, Spec, Review and Photos. The first BMW M5 arrived on our shores in 1987, it was the quintessential Q-ship, an innocent-looking 5-series powered by the engine of the legendary M1 supercar. Previewed by this concept, the upcoming, fifth-generation of the ultimate 5-series doesn't look quite so innocent anymore.

The capability to reach that speed comes from a twin-turbocharged 4.4-liter V-8. It's basically the same engine used by the X5 M and X6 M, in which it makes 555 hp. In the M5, that total is likely to increase. This engine will make the M5, after the two M SUVs and the 1-series M coupe, the fourth car to deviate from the former and now-obsolete M gospel of high-revving naturally aspirated engines. As consolation, M GmbH development chief Albert Biermann hints that the turbo V-8 will rev beyond 7000 rpm, and BMW promises a 25-percent increase in fuel economy over the 8200-rpm V-10 in the previous M5.

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