2023 Audi S8:br br Performancebr br Engine Name V8 Turbo 4.0 Liter TFSI®br Trim quattro Sedanbr Horsepower 563br Torque 590br Number Of Cylinders 8br br Interior Dimensions:br br Front Headroom 38.3 inbr Rear Headroom 38.5 inbr Front Legroom 41.5 inbr Rear Legroom 44.3 inbr Front Shoulder Room 59.