The Ford Shelby GT500KR Mustang has 900 horsepower and is known as the "King of the Road." | Modified Rides

The Ford Shelby GT500KR Mustang has 900 horsepower and is known as the "King of the Road." | Modified Rides: Welcome to the Ford Shelby GT500KR Mustang, Internet. KR means for 'King of the Road,' and the emblem was featured on heavily modified GT500s in both 1968 and 2008, according to Mustang nerds.