Two years ago, the Maserati GranTurismo replaced the GranSport model. The standard 2010 Maserati GranTurismo comes equipped with a 405-horsepower 4.2-liter V-8, while the sportier GranTurismo S gets a 4.7-liter engine with 433 horsepower on tap. The GranTurismo Convertible also gets the more powerful 4.7-liter V-8. Standard across the GranTurismo range is a six-speed ZF automatic transmission.