TechArt GrandGT Supreme is a faster, fancier Porsche Panamera Sport Turismo

TechArt is a German tuner that does more than just make Porsches even faster than they already are. The company also makes these luxury cars more luxurious. At the Geneva motor show, TechArt will show a range of new products, highlighted by the GrandGT Supreme, which is a gussied up version of the Porsche Panamera Grand Turismo. TechArt starts...