The 2003 Jaguar XK8 gets some serious engineering refinements this model year, including new engines and new transmissions. The XK series includes the Jaguar XK8 and the upper-level XKR, in two door Coupe and two door Convertible body styles. Engines range from a 294 horsepower 4.2-liter V8 to a 390 horsepower 4.2-liter V8. The XK series comes beautifully equipped with a long list of luxury and safety features. Inside, it boasts auto climate control, cruise, keyless entry, full power accessories, navigation, heated seats, a pre-wired telephone and CD changer.