The 1999 Porsche Boxster is available as a 2-door, 2-seat convertible. Starting at $41,000, the 1999 Porsche Boxster (M5) is powered by a 2.5L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway. The top of the line 1999 Porsche Boxster (A5), priced at $44,210, is powered by a 2.5L, 6-cylinder engine mated to a manual transmission that returns an EPA estimated