The Infiniti M45 is a mid-size luxury performance sedan that was produced by the Japanese automaker Infiniti from 2004 to 2010. Designed to compete with other Japanese luxury performance sedans such as the Lexus GS430 and Acura RL, the M45 came equipped with a powerful 4.5-liter V8 engine, 4-wheel independent suspension, high-performance brakes, and a 6-speed automatic transmission. The M45 was also the first Infiniti model to be offered with a DVD-based navigation system and a power moonroof.