The 2008 Audi A8 carries over with few changes. This is Audi's largest, most expensive car. It comes in regular-length and in L versions that are about five inches longer in wheelbase and overall length. Base and L versions have a 350-hp 4.2-liter V8 engine. The sporty S8 is a regular-length model that has a 450-hp 5.2-liter V10. The top-line W12 is an extended-length sedan that has a 450-hp 6.0-liter 12-cylinder. All A8 models have Audi's quattro all-wheel drive, a 6-speed automatic transmission, and a driver-adjustable suspension. S8s have specific suspension tuning, trim, and styling. Base and L models offer a Sport Package with uprated suspension and steering wheel gearshift paddles. Available safety features include ABS, traction control, antiskid system, curtain side airbags, and front and rear side airbags, as well as front knee airbags. Front and rear obstacle detection, keyless entry/starting, and adaptive cruise control are among the available features.