At last, the new Audi RS5 spotted on the Nurburgring Track undergoing test run. According to sources, this new Audi RS5 is believed to be using a twin turbo 4.2Liter V8 engine power plant. The design of the RS5 is indeed sexy in every way. This is Audi true calling for a battle of the best coupe against BMW M3. It would be great to see both of the super coupes head to head battle on a race track.