New Porsche 911 Turbo: The full details

Porsche has released details of its latest 911 Turbo model, which will feature four-wheel drive and - for the first time - four-wheel steering.

A range topping 'S' model will produce a staggering 552bhp. The standard model has to make do with 'only' 513bhp – but that is still twice the power of the original 1974 911 Turbo.