For those who find the Audi S5 lacking in excitement, Audi Sport offers the RS5, equipped with a powerful 450-horsepower 4.2L V8, introduced to the US market in the 2013 model year. The second-generation RS5, starting in 2018, transitioned from the high-revving V8 to a twin-turbocharged 2.9L V6, a powertrain shared with models such as the European-market B9 RS4 and the Porsche Macan Turbo.