ATLANTA, Jan. 8, 2017 /PRNewswire/ -- Porsche is expanding the 911 model line with five new GTS models: the 911 Carrera GTS with rear-wheel drive, the 911 Carrera 4 GTS with all-wheel drive — both available as a Coupé and Cabriolet — and the 911 Targa 4 GTS with all-wheel drive. The...