Both the XK8 and XKR are limited to a top speed of 155 mph (250 km/h) by a computer governor, giving them a lower top speed than the car they replaced. The XK8 heralded a change in direction for the company, resulting in the S-Type and X-Type.
Both the XK8 and XKR come standard with 18-inch alloy wheels, and 19 and 20-inch 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. The XK series ranges in price from US$69,830 - US$86,330.
Source: Jaguar Press Release