When we saw the Ginetta G55 GT4 class racecar, we were impressed. Packing a potent 370HP engine at an affordable price, it's good looking, too, even though for obvious reasons that matters a lot less in the world of motorsports. Now, Audi also wants a piece of the GT4 action. On the occasion of the DTM race in Shanghai, the German automaker presented the concept of a GT4 car based on the TT sports coupe. Read more »