The C8 S6 is powered by a 2.9-liter twin-turbo V6 rated at 444 horsepower and 443 lb-ft. It adds a 48-volt mild-hybrid system and an electric compressor, the only Audi petrol engine known to use one. Quattro all-wheel drive is standard. Ours is a 2021 S6 Premium Plus with the Sport Package and optional wheels, in Florett Silver Metallic.