Jaguar redesigns its coupe and convertible for 2007 with new styling and aluminum-intensive construction. The XKs retain V8 power and a four-seat cabin, but weigh some 300 lb less than the steel-body 1997-2006 versions, despite being 7 inches longer in wheelbase, 4 inches wider, and an inch longer overall. Coupes adopt a hatchback design with a hinged rear roof section. Convertibles again use a power soft top with heated glass rear window. XK keeps its 4.2-liter V8, but base models now have 300 hp vs. 294. Supercharged XKRs have 420 hp vs. 390. Both reprise a 6-speed automatic transmission, but now with steering wheel paddles for manual operation. ABS, traction/antiskid control, and automatic-adjusting suspension are standard; XKR has sport suspension tuning. All models have front side airbags that provide torso and head protection. Convertibles have rear rollover bars designed to deploy in an impending tip. All XKs have a navigation system, wireless cell phone link, keyless entry and starting, and bi-xenon headlights. Adaptive cruise control is available.