The ABT Audi S8 is “faster than a current generation 992” thanks to the German tuning company’s extensive performance upgrades. The standard S8’s 4.0-litre bi-turbo V8 already puts out 563bhp which seems to be more than enough for a fast but discreet luxury limousine. One would also assume a 3.9-second 0-62mph sprint would be adequate. […]