With 400 HP versions of the Chevy Camaro and Dodge Challenger hitting the streets in the next few years, the Mustang GT and its 300 HP will quickly be regulated to backmarker status. Sure, there's the terrifying Shelby GT500 on its way next year, but its price will put it out of the reach of many Mustang buyers. As a result, Ford is said to be working on a Boss version of the S197, possibly using a naturally-aspirated 5.4L version of its Mod motor architecture in an attempt to keep up in the horsepower wars. The FPV version of this engine used down under produces 390 HP, which should provide 'stang buyers with sufficient power to wage battle on the crosstown competition.

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