Despite some critics ’remarks that the XJ’s design is outdated, it’s still agreed that this Jaguar is a modern car with sharp handling, smooth driving and powerful engines, especially the V8 (the most powerful 4.2l has 400hp power) and diesel. Although the exterior and interior have remained the traditional design, the car has been completely redesigned. Like the Audi A8, this jaguar's body and chassis are made of aluminum.