More than arguably any other car, Ford's RS500 comes to mind when talking about touring car racing's most spectacular machines.
In many ways the turbo tin-top was flawed. Chiefly, the Sierra chassis and its rubber were incapable of coping with the 500+bhp its two-litre engine produced.
Despite (or perhaps because of) that, the RS500 could just be the greatest touring car of all time. The flame-spitting turbos won around the world and were memorable to watch even if they weren't battling wheel to wheel.