The 1999 BMW 323 is available as a 4-door, 5-seat sedan. Starting at $26,400, the 1999 BMW 323 Sedan is powered by a 2.5L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 29-mpg on the highway. The top of the line 1999BMW323iCA (A4) Convertible , priced at $ 34,700 , is powered by a 2.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.