The XJ is built on a light and strong all-aluminum structure. Two engine options are available: a 300-hp 4.2-liter V8, or a 400-hp 4.2-liter supercharged V8. Both engines send power through a six-speed automatic transmission. An adjustable air suspension is responsible for the XJ's impressive road handling abilities and luxurious ride. Safety features include dual front airbags, side curtain airbags, and front side-impact airbags. Anti-lock brakes, traction control, and electronic stability control are standard. For 2009, the XJ8 and XJ8 L (long wheelbase) will now feature a standard navigation system and a 320-watt, 12 speaker Alpine stereo.