The FX35 is available in two drivetrains, the RWD and the AWD, which are both fitted to a dual overhead cam 3.5-liter 24-valve V6 VQ35DE gasoline engine, with aluminum-alloy block and heads, electronically controlled throttle system, and low-friction molybdenum-coated pistons that makes use of the continuous variable valve timing which in part optimizes the opening of intake valves.

This is also coupled with an electronically controlled super-wide ratio five-speed automatic with a manumatic shift mode that includes the option of sequentially selected manual gearshifts and downshift rev-matching.

[4][5][6][7][8] In 2003 for the 2004 model, changes were the addition of a standard eight-way power front passenger seat that replaced the previous four-way design, the availability of aluminum roof rails and chrome-plated 20-inch wheels.

Infiniti's system monitored the lane markings to alert passengers via an audible buzzer that the driver is drifting unintentionally.

The LDW system, which utilizes a small camera, speed sensor, an indicator, and an audible warning buzzer, was offered on models.

The 2005 Infiniti FX was the first passenger vehicle to offer a lane departure warning system in the United States market.

The FX45 featured additional upgrades, including new 20-inch wheels, leather-appointed seats, a revised sport-tuned four-wheel independent suspension with new dampers, a Bluetooth system, and the Premium Package became standard.

The redesigned 2009 Infiniti FX was officially unveiled at the Geneva Motor Show on March 4, 2008, and went on sale in June 2008.

Features of the new design included longer, shark-like sculpted headlights, a large trapezoidal grille filled with horizontal dark-chrome waves, and functional side air vents.

The interior was completely redesigned to bring the FX up to the level of luxury found inside of other Infiniti models like the G37 and EX35.

[19] Features included stitched leather seats, stained maple wood or piano black finishes, and matte-finish surfaces.

The FX37 GT came equipped with 20-inch alloy wheels, power and heated/ventilated front seats, adaptive xenon headlamps, parking camera sensors, all-wheel-drive, and a 7-speed automatic with paddle shifting.

Although a V8 diesel engine was entertained, the V6 format was selected early on as the ideal layout for the unit, providing the optimum balance between overall performance and refinement.

Other standard features include Scratch Shield paint (first introduced on the Infiniti EX), black lacquer interior trim, high-intensity discharge (HID) headlamps, LED brake lamps, 12-point sequential welcome lighting, electronic liftgate closure assist, automatic dimming rear-view mirror with compass, glass moonroof, rear privacy glass, integrated rear spoiler, and dual chrome exhaust tips.

Options include Infiniti's Hard Drive Navigation with touch screen and 3D building images, All-Around View Monitor (first introduced on the Infiniti EX) which displays a virtual bird's-eye view of the vehicle and surroundings to aid in parking, and Intelligent Cruise Control, which provides the benefits of standard cruise control with the ability to add speed and distance intervals, as well as automatically slowing the vehicle in slowing traffic to help provide a safe distance.

Optional industry-first Distance Control Assist intuitively helps the driver release the throttle and apply the brakes as needed in slowing traffic.

The Premium Package adds heated and cooled front seats, a power-adjustable steering wheel, iPod integration system, folding outdoor mirrors, and aluminum paddle shifters to adjust the gears when using the manual shift mode.

[21][22] It is a version of the Infiniti FX50 with Moonlight White body color, matte white exterior color, F1-inspired carbon fiber front air dam with white LED running lights, F1-inspired side skirts and rear air dam, 21-inch 10-spoke black-finish aluminum wheels, dark-tinted adaptive headlamps, dark tinted rear tail lamps, satin aluminum door handles, side air vents and exterior trim, carbon fiber rear wing, carbon-fiber interior trim, F1-inspired steering wheel and suede seating surfaces, unique Sebastian Vettel badging on the side fenders, rear liftgate, interior center console and embroidered front seats; increased engine power to 420 PS (309 kW; 414 hp), a front air dam providing increased downforce, 20 millimeters lower ride height and 30 percent improved coefficient of drag over the standard FX.

[24] It is a limited (150 units (50 in Western Europe)) version of the Infiniti FX50 based on the Sebastian Vettel Edition concept, with Moonlight White body color.