When the 96 Mustang came out with the 4.6-liter V-8, some performance enthusiasts were scared away by its technology. But those days are long gone. Ford added horsepower and torque to its 2- and 4-valve V-8s over the years, and the number and quality of available aftermarket performance parts has exploded. Ford took things to the next level with the new 3-valve Mustang GT engine, the 5.4-liter GT and the Shelby GT500, adding even more high-performance options.