The 2006 Porsche 911 is available as a 2-door, 4-seat coupe. Starting at $81,400, the 2006 Porsche 911 RWD Cabriolet is powered by a 3.6L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 18-mpg in the city and 26-mpg on the highway. The top of the line 2006Porsche911RWD Club Coupe , priced at $ 99,911 , is powered by a 3.8L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated