Audi RS6 is the sportiest version of A6 Sedan and Avant models. In its current production cycle the RS6 is offered only as an Avant, which isn't on sale in the US. The most aggressive version, the RS6 performance, is capable of reaching 62 mph from 0 in 3.7 seconds. The car is popular among enthusiasts who like to have a combination of a four-wheel drive sports car and an everyday-functional wagon.