All versions of Cadillac's two-seat V8 convertible have a 6-speed automatic transmission for 2007. XLR shares a basic structure and plastic composite body panels with the Chevrolet Corvette, but has unique styling, a power-retractable hardtop, and different suspension tuning. Base models have 320 hp. The supercharged XLR-V has 443 hp. Both have a 6-speed automatic transmission; the 320-hp models had used a 5-speed. ABS, traction/antiskid control, run-flat tires, and GM's automatic-adjusting Magnetic Ride Control are standard. So are side airbags covering head and torso and heated/cooled seats. A dashboard screen displays navigation and audio functions. Also standard are adaptive cruise control and keyless locking and engine start.