The Audi S8 is stylish, spacious and with performance to burn. ABT Sportsline just couldn’t resist tuning the luxury sedan. The Audi’s 4.0-liter twin-turbo V8 was the first area to receive modification. Without revealing what mods it made, ABT Sportsline claims the Audi S8 has increased by 120 hp and 96 lb-ft of torque to 640 hp and 575 lb-ft. The result is a new top speed of 174 mph. Other upgrades include a stainless-steel quad exhaust, a 25-mm electronic lowering module and a selection of 20- and 21-inch alloys.