The C6 RS6's appeal is its sheer absurdity: a 580 hp Lamborghini-derived twin-turbo V10 in a wagon (or sedan). Enthusiasts genuinely call it a unicorn — the ultimate Q-ship longroof for anyone who finds the contemporary E61 M5 too pedestrian.
An intercontinental-ballistic V10 longroof unicorn
Audi RS6 (C6) · value-and-market