Audi S8 is a high performance and luxurious car. also it's very expensive, this 2009 model is nearly $96,000. it has 5.2 liter V10 engine that generates 336KW power. Audi S8 has GDI fuel system which increase the fuel efficiency. it has lot's of laxurious features like Bose audio system, satellite TV and automatic sunroof.