The 2005 Maserati Quattroporte is a 4-door, 5-passenger luxury sedan, available in one trim only, the Sedan. The 2005 Maserati Quattroporte's competitors include the Audi S4, the Cadillac CTS-V, and the Mercedes-Benz C-Class. Upon introduction, the Quattroporte is equipped with a standard 4.2-liter, V8, 400-horsepower engine that achieves 12-mpg in the city and 15-mpg on the highway. A 6-speed automatic transmission with overdrive is standard. The 2005 Maserati Quattroporte is all-new for 2005.