6. Ford Sierra Cosworth RS500
Notable Features: 224 hp, most successful touring car in the world in the '80s.
Complex Says: This was another race homologation special, and production of the road car was limited to just 500 copies. The race version so dominated the World Touring Car series that the officials rewrote the rules to exclude the Sierra Cosworth RS from competition. If rules have to be written to kick you out, you know you have a ridiculous car. This is one of many European Fords that have never officially seen U.S. shores.