This TT concept turned the fun-loving coupe into a bona-fide track terror. First unveiled at Wörthersee in 2015, the high-performance concept unveiled an electric biturbo arrangement for the RS-spec 2.5-liter five-cylinder engine. Power output was 600 horsepower (441 kilowatts), sent to all four wheels through a six-speed manual gearbox. Despite the larger engine and add-on body work, the car weighed in at just 3,077 pounds (1,396 kilograms) and could blitz to 100 km/h (62 mph) in 3.6 seconds.