The Jaguar XK8 is a grand tourer car that was launched in 1996. It was the first generation of a new XK series. The XK8 was available in coupe or convertible body styles and with the new 4.0 litre Jaguar AJ-V8 engine. In 1998 the XKR was introduced with a supercharged version of the engine. From 2003 the engines were replaced by the 4.2 litre AJ34 engines in both the normally aspirated and supercharged versions. The first-generation XK series shares its platform with the Aston Martin DB7. Both cars are derived from the Jaguar XJS, though the platform has been extensively changed. One of the revisions is the use of the second generation of Jaguar's IRS unit, taken from the XJ40.
Both the XK8 and XKR are electronically limited to a maximum of 155 miles per hour (249 km/h). The top speed of its predecessor, the XJS V12, was approximately 158 mph (254 km/h). The XK8 heralded a change in direction for the company, resulting in the S-Type and X-Type.
The XK8 come standard with 17" alloy wheels, while 18" (Standard on the XKR), 19", and 20" wheels are available for additional cost. A navigation system and self-leveling xenon headlamps come standard with the XKR and as options for the XK8. Jaguar's Adaptive Cruise Control is an optional feature available on both models. Both come with all-leather interior, burl walnut trim, and side airbags. In 2004 the grille design of the XKR was refreshed.
Source: Wikipedia, 2012