Concept cars are the "what if" of the automotive world. These are often something like "What if Audi put a turbo-diesel V12 ...

Audi toyed with the idea of putting a twin-turbo V12 engine in the Audi R8. The proof of concept was a model called the Audi ...

When Audi initially told us it would build a supercar to take on the Porsche 911 we all laughed. Audi, a company better known ...