Audi's largest, most-expensive car gets more V8 power and adds a performance model for 2007. A8 comes in regular-length models and in L versions that are 5.1 inches longer in wheelbase and body. Base and L versions use a V8 with 350 hp, up 20 hp for '07. Based on the L model, the W12 has a 450-hp 12-cyl engine and extra standard features. Added for '07, the S8 is a sporty regular-length model with a 450-hp V10. All these cars come with Audi's quattro all-wheel drive, a 6-speed automatic transmission, and a driver-adjustable suspension. S8 has specific suspension tuning and styling. Base and L models offer a Sport Package with uprated suspension and steering wheel gearshift paddles. All these Audis come with front and rear side airbags, front knee airbags, and curtain side airbags. Also standard are ABS, traction/antiskid control, and a navigation system. A rearview camera is standard on the W12, optional on the other models. DVD entertainment is exclusive to the W12. Front and rear obstacle detection, keyless entry/starting, and adaptive cruise control are also available. Note that the 2008 Audi A8 earned the Consumer Guide Recommended label, but further information about this car was unavailable in time for print.