According to Mustang fan site StangsUnleashed.com, this is the new 4.6-liter DOHC V8 that will power the higher performance-spec Mustang, whether Bullitt or Mach 1. According to a site's source, the uprated mill will produce in range of 400 hp — naturally aspirated — when it debuts in mid-2008. The Bullitt/Mach 1 will also reportedly come with a suspension tuned by Ford Racing and far better brakes than the push-and-pray setup currently offered. Could that new road-racing series be far behind?
2008 Bullitt Mustang Engine News [Stangsunleashed.com]