The XJ comes in regular and long-wheelbase versions. It has a rigid lightweight aluminum structure and computer-controlled double-wishbone suspension. The Jaguar XJ series comprises six models. In base versions, XJs are powered by 4.2-liter V8 engines. The XJR and Super V8 models are supercharged. The XJ8 and XJR are built on the standard 119.4-inch wheelbase. The XJ8L, Vanden Plas, and Super 8 are built on a longer 124.4-inch wheelbase that stretches the overall length of the vehicle from the standard 200.4 inches to 205.3 inches.For 2007, The Jaguar X-Type receives a tire pressure monitoring system and laminated side glass.