The Shelby Mustang was the mass market's first access to the legendary Ford and Shelby partnership. Built using a stock Ford Mustang, and making various component and powertrain improvements, these performance oriented cars are a perfect example of classic American muscle. The market for Shelby Mustangs features a great number of replicas and recreations, each with its own degree of authenticity and customization. Due to these variations, these car's values vary greatly depending on their individual provenance and require car by car scrutineering.