The 4.0-litre twin-turbo V8 has been boosted from the standard RS6's 552bhp and 516lb ft of torque to 597bhp and 553lb ft (via an overboost feature), while the 0-62mph sprint is 0.2 seconds quicker than before. Audi says the eight-speed Tiptronic auto has been fettled to handle the extra shove, too As for looks, Performance-spec cars are beset with matt titanium detailing in the front bumper, including an etched 'quattro' graphic at the base of the grille. Inside, RS leather and Alcantara 'super sports' seats are standard, and the interior benefits from carbon fibre inserts and Alcantara in places in the cockpit.