The Ford Sierra RS Cosworth is significant in many different ways, but as with any automotive platform, there are a handful of standout examples that have made the platform what it is today. This prototype 1987 RS500, for example, was integral to Ford’s design and development process, and one of only four built to take on the company’s testable components.
To prepare for the introduction of an evolutionary model alongside the company’s previously-announced Cosworth, the RS500 was conceived. As a performance-focused variant built to adhere to racing’s newly-released Group A guidelines, a mechanically updated engine was gifted to the car, bringing it to a healthy and hearty 224 horsepower. But that wasn’t the only thing it needed to become track-ready. Modified bodywork and improved braking systems were added, as well as an assemblage of in-development items, to include Ford’s prototype turbo and intercooler platforms. Over the course of its life, the RS500 (Chassis #03) would accrue only 69,000 miles, while undergoing regular, well-documented maintenance to keep it as close to period-correct as possible. Now, the vehicle has been listed for auction via Silverstone Auctions for an estimated $77,520+.