With the introduction of the 2008 Ford Shelby GT500KR model, Ford and Shelby will have unveiled four Mustang variations in a little over a year's time. The GT500KR will be easily the most powerful of a bunch that also includes the 500-horsepower GT500 and the 319-hp Shelby GT, as well as the limited-edition Shelby GT-H produced for use in Hertz rental fleets.
The GT500KR revives a name last used 40 years ago. It will be powered by a version of the standard GT500's supercharged 5.4-liter V8 that makes about 40 hp more. That would bring the total to 540 hp, although Ford is not yet ready to commit to that number officially.
Whatever the specific increase turns out to be, it comes from the Ford Racing Power Upgrade Pack, which includes a cold-air intake and a louder low-restriction exhaust. The KR should also feel a bit faster thanks to recalibrated ignition timing and electronic throttle settings, which promise quicker throttle response.
The engine will be bolted to the same Tremec six-speed manual transmission as used for the regular GT500, although the KR version gets a shift linkage with 25 percent shorter throws and a big, white ball on the shift lever. The KR also gets a boost in acceleration from a shorter, 3.73:1 final-drive ratio (in place of GT500's final-drive ratio of 3.31:1).
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