Infiniti introduced the FX line of luxury crossover vehicles for 2003, the FX45 represented the eight-cylinder powered version. Created through a design practice called cool fusion by Infiniti, the 2003 FX45s shapely body contours exhibited a blend of sports sedan and sport utility vehicle traits. Settled on a 112.2-inch wheelbase, the FX45 shared a car-like platform with the Infiniti G35 and the M sedan. The Infiniti M45 also lent the 2003 FX45 is 4.5-liter V-8 engine. Producing 280 horsepower, the powerplant was linked to five-speed automatic transmission. Unlike the V-6-powered FX35, the FX45 was not offered as a two-wheel drive model. The standard-equipped ATTESA E-TS (Advanced Total Traction Engineering System for All Electronic Torque Split) all-wheel drive system is a high-performing unit capable of on-road or off-road conditions. Four-wheel ventilated disc brakes, Brake Assist, Vehicle Dynamic Control and traction control came standard equipped on the 2003 FX45 providing the luxury crossover with steady, safe handling.
The five-passenger cabin of the Infiniti FX45 is includes standard leather seating, aluminum pedals and heated front seats. An optional Premium Package for the crossover included a Bose audio system, HomeLink Universal Transceiver and sunroof. Adding some features in 2004, the Infiniti FX45 was also given a power bump to 315 horsepower. The luxury crossover received slight styling retouch for the 2005 model year with a dark chrome grille on the outside and etched aluminum trim inside. For 2007, more considerable facelift involving a new 20-inch wheel design along with a host of new standard features such as power folding mirrors, Bluetooth, aluminum roof rails and sunroof. For the 2009 model year, an all-new eight-cylinder engine was introduced to the Infiniti FX crossover vehicle line-up translating into the FX50.