The Ford Shelby GR-1 concept car was unleashed on the world in 2005 and has left car fans wondering what if ever since. It was inspired by the Shelby Daytona from 1964, and looked simply stunning. It had a 6.4liter all-aluminum V10 engine wedged under the hood, producing up to 605hp. And outside, its shimmering polished-aluminium body was a thing of beauty to behold. It boasted 19in wheels and butterfly doors, and was designed to be fully roadgoing and production-feasible. It is one of a string of recent concept cars from Ford, and came hot on the heels of their Shelby Cobra concept from 2004, which was another jaw-dropper.