a 4.0-liter twin-turbo V-8 under its hood. Power is rated at 560 horsepower, served up from 5700 rpm, and maximum torque is 516 lb-ft, available from 1750 rpm. Torque is transmitted to all wheels through an eight-speed ZF-sourced automatic and an all-wheel-drive system with an oil-cooled center differential. The system offers variable torque distribution, but the standard setup sends 40 percent of power to the front wheels and 60 percent to the rears. Audi claims that the sprint from zero to 62 mph takes just 3.9 seconds before reaching a governed top speed of 155 mph. Optional performance packages will raise that top speed to 174- and 190 mph, although it’s possible that just one of these packages will make it stateside.