The 2004 Porsche 911 is available as a 2-door, 4-seat coupe. Starting at $191,700, the 2004 Porsche 911 GT2 RWD Coupe is powered by a 3.6L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 15-mpg in the city and 23-mpg on the highway. The top of the line 2004Porsche911Carrera 4S AWD Cabriolet , priced at $ 93,200 , is powered by a 3.6L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.