2004 JAGUAR XJR X

The XJR adds a supercharger that forces air into the V8, producing 390 horsepower. This propels the XJR from 0 to 60 mph in 5 seconds, according to Jaguar, very quick indeed. This rocket ship also gets a stiffer suspension, bigger brakes and fat 19-inch tires that grip the road even better. Amazingly the ride is not too harsh despite the short sidewalls. These tires cause the steering to feel a little tighter. But it is the whine of the supercharger as you press the gas pedal that sets the XJR apart from the rest of the pack. Previously the XJR has been penalized with the gas guzzler tax but no more. Its lighter weight means fuel consumption is all but identical to the old JX8. Brakes on the new XJ models are powerful yet smooth and don't grab unless you really need them to. The XJ now gets the same electronic parking brake that first appeared in the 2003 S-Type. A small lever is pulled to set it and it's automatically deactivated when drive or reverse is engaged, an elegant setup.