Looks like the BMW M5 is in deep-deep quattro trouble; the RS6 comes equipped with a Lamborghini Gallardo derived,580 Hp Biturbo 5.0-litre V10 that sprints the sexy Avant from 0 to 62 mph in 4,6 seconds. Comparatively, the 507 Hp M5 Touring needs 0,2 sec more.
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