For the 2005 model year, Maserati introduced a full-size four-door luxury sedan called the Quattroporte. Designed by Pininfarina, the rear-wheel-drive Quattroporte competes with the Audi A8, BMW 7 Series and Mercedes-Benz S-Class. Changes for 2008 include the addition of a new Sport GT S trim level that sits above the rest with added equipment for sport-minded buyers. High-performance brakes, 20-inch dark chrome wheels, a stiffer suspension and lowered stance are some of the differences you'll find on the Sport GT S.