The 2020 Audi RS 6 Avant performance wagon is coming to the U.S. next year. Its turbocharged V-8 produces 591 horsepower and 590 pound-feet of torque. It will hit 60 mph in 3.6 seconds. It is the first RS 6 model to come to America since the 2003 RS 6 sedan, which was only available here for one year.