The Infiniti FX is a mi-size Crossover SUV produced by the Nissan-owned Infiniti luxury vehicle brand since the 2003 model year. The FX replaced the QX4 as Infiniti's mid-size luxury-type SUV, despite being larger than its predecessor. It was released at the same time as its competitors, the Porsche Cayenne, Volvo XC90, and Volkswagen Touareg. It shares the same FM platform as the rear-wheel drive Nissan 350Z, whereas the similarly-sized Nissan Murano is based on the front-wheel drive Nissan Altima platform.