autoevolution 28 Jan 2021, 13:54 UTC · by There are some cars out there better left untouched. Doing so will help increase their value in time, as modern-day collectors usually spare no expense when it comes to fulfilling their dreams. The Shelby GT500KR of yesteryear is one of those cars. 17 photos How much Shelby’s touch can up the price of an old Ford Mustang is no secret anymore. Add to that the KR moniker, the two letters that have come to represent the most powerful conversion of its kind at the time, and you definitely have something worth in the mid-six-digit range on your hands.