The RS name was phased out in the US during early production on 1985 models. All 1985 Capri RS models built after this point would be called Capri 5.0L. The only difference would be the replacement of the RS embossed quarter panel molding with a smooth one & the decal on the hatch would be replaced with a chrome Capri emblem. This would be the starting point for the Mercury Motorsport Capri
Mercury then approached ASC McLaren. In 1984 & 1985 ASC McLaren had been modifying Capri’s into upgraded coupes and convertibles just as Shelby had done in the 60’s. They would be brought in to help design & modify the Motorsport Capri.
In the spring a white Capri 5.0L was pulled off the lot of Spiker Ford/Lincoln/Mercury in Milford, MI and sent to Graphix Concepts in nearby Novi. This car would serve as the prototype.
Graphix Concepts would design and add the decals. Each side of the prototype would have a different decal style. The driver's side had red strobed stripes starting below the door molding and becoming taller in size as they reached the back of the car, then wrapping around onto the rear hatch. This style closely resembled the Trans-Am Series Capri's. The passenger side had vertical red stripes only on the white section of the car & less sloped than the other side. The reasoning for the 2 different decal styles was to give Mercury 2 different choices. The passenger side scheme ultimately would be chosen. The prototype would then be stripped of the decals that weren't chosen & given a new decal to match the other side of the car. ASC McLaren then added their components. Since the Motorsport Capri & the Motorcity 100 was to be a showcase for Mercury, the cars would not get the full treatment ASC McLaren coupes or convertibles received. Just the rear wing, ground effects & light covers would be added. The ASC McLaren name was nowhere to be found. Unlike the ASC models, all cars would retain all of the factory emblems.
The prototype was then approved for production.