The brand's flagship XJ sedan is available with two wheelbase lengths for those who love driving (both cases) and those who prefer to be driven (the XJL). A supercharged, 3.0-litre V6 with 340 horsepower motivates this big luxurious sedan, sending its power to pavement through an all-wheel drivetrain. However, the XJR swaps the V6 for a supercharged, 5.0-litre V8 that produces 550 horsepower.