...The XK8 has heated front seats and a premium, 320-watt Alpine audio system with a cassette player and six-CD changer. Jaguar’s navigation system is optional. Under the Hood The XK8 coupe’s new 294-hp, 4.2-liter dual-overhead-cam V-8 engine drives a six-speed-automatic transmission. Safety Jaguar’s Adaptive Restraint Technology System (ARTS) includes head and thorax side-impact airbags mounted in the front-seat backrest cushions, and their deployment is based on input from sensors. Traction control and all-disc antilock brakes are standard. Reverse Park Control emits a...