The M sedan enters 2008 with several changes, including a revised interior and exterior, added luxury and safety amenities, and a new all-wheel drive version. Infiniti now offers its luxury sports sedan in four models: M35, M35x AWD, M45, and M45x AWD. The M35 comes equipped with a 275-hp 3.5L V6 engine, while the M45 boasts a 4.5L V8 that produces 325 horsepower. Both engines are coupled to a five-speed automatic transmission with a manual shift mode and a performance shifter. The navigation system has been upgrades for this year, featuring a touch-screen, a 9.3g music hard drive, and the optional XM satellite radio and traffic system. For safety, Infiniti adds the new Lane Departure Prevention (LDP) system on all models.