Audi Space Frame Studie that became the A8. In 1993 this technology carrier was presented on the IAA in Frankfurt. It fascinated not only by its technic, the polished aluminium body alone would have been enough to make it a show winner. The V8 TDI showed even back then, that the Diesel engine would continue its road to success in the luxury class. The A8 on the right has the 3.3 litre V8 TDI.Today S8 (followed by the other S-modells) wears aluminium rear view mirrors to commemorate the polished body of the concept car.