The engine is basically the same as in the normal S8, but the 4.0-litre twin-turbo V8 has power boosted by 84bhp to 597bhp. Torque rises to 516ft lb but if that’s not enough, then an overboost function can briefly raise that to 553lb ft. These figures, Audi claims, mean the S8 Plus can do the 0-62mph rush in just 3.8sec, the fastest ever for an S8.