Loosely based on the Audi RS5, the Audi Quattro concept sits on a wheelbase that has been shorted by almost 6 inches. The rear overhang was shortened by 7.9 inches, and the roofline was lowered by 1.6 inches. Together, these reductions add up to a much tighter package and very aggressive look. To help bring the weight down to 2,900 pounds, roughly the same weight as the 1984 Sport Quattro, Audi replaced the steel body of the production RS5 with a custom aluminum spaceframe, covered with carbon fiber panels. The RS5’s V-8 and dual-clutch transmission was also swapped out for a turbocharged five-cylinder and a manual six-speed gearbox (another nod to the original car), further reducing weight.