The new design did an admirable job of evoking the spirit of the '64 1/2 models, and a facelift in 1999 sharpened up the lines and gave the car a look that was both modern and retro. This idea was carried over into the current generation, in production since 2005, which calls on the 1967 body style for inspiration. These new Mustangs, in GT trim, started out with a 300-horsepower 4.6-liter V8, a holdover from the previous generation. But for 2011, Ford brought out a new 5.0-liter V8 for the GT, which produces 412 horsepower. There is also a 305-horsepower V6, a Boss version with a tuned 5.0 and a Shelby Mustang, which puts out an astonishing 662 horsepower.