The Mustang ranges in power from the Coupe 2D with horsepower to the Shelby GT Coupe 2D with horsepower. For a more detailed look at the The entry-level model features a hp litre V6. At the other end of the spectrum is the spectacular Shelby GT powered by horses. These are offered. Used Ford Mustang GT Premium - Specs & Features ; V8 · Gas · hp @ 6, rpm · lb-ft @ 4, rpm.