It is a sports car, performance version of Audi A4, that launched in 2000 and has 4 different generations, B9 being the latest. Audi RS4 features permanent all-wheel drive system (quattro). Compared to a regular A4, the RS4 had stiffer suspension, more powerful powertrains, as well as different exterior trims. There was no RS version of Audi A4 B6. First and second generation RS4’s was only available equipped with manual transmission, while third and fourth generations only available with automatic transmission.