The 2014 Porsche Boxster is available as a 2-door, 2-seat convertible. Starting at $50,400, the 2014 Porsche Boxster Base is powered by a 2.7L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 30-mpg on the highway. The top of the line 2014PorscheBoxsterS , priced at $ 62,100 , is powered by a 3.4L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway.