Nissan's flagship sedan has officially gone into production today. The first '09 Maxima rolled off the assembly line at Nissan's Smyrna, Tenn. manufacturing plant.The new Maxima is built on Nissan's new D-Platform but is powered by an upgraded 3.5 litre VQ V6 engine producing 290bhp, a 35bhp increase than the current model but still less than the new 3.7 litre V6 with 330bhp (borrowed from the