Two different models of the 2012 Infiniti FX are offered—the FX35 and FX37—but with the two models looking essentially the same and both offering more than enough power, it's really a matter of whether you want a V-8 and how much money you're willing to spend.
The FX35 gets a 303-horsepower, 3.5-liter V-6, while the FX50 has a 390-hp, 5.0-liter V-8. Both get a new seven-speed automatic transmission, and while FX35 models can be had with either all-wheel drive or rear-wheel drive, FX50 models come only with AWD. For most buyers, the V-6 will be plenty fast, and the engine is still among the sweetest V-6 engines around. With either of the engines, the seven-speed automatic shifts quickly and responsively, too.
The V-8 is clearly even faster—about a second faster to 60 mph, in about five seconds—but we tend to think that for those who lack unlimited fuel budgets and off-duty-cop status the V-6 version with rear-wheel drive is the sweetest pick of the bunch.
Overall, the FX models handle as if they're considerably lighter, and they have a sense of poise and balance on a curvy road that's better than most other SUVs and crossovers. AWD models add some all-weather ability, but beware that the systems still have a rear bias, plus low-profile performance tires, so the FX isn't a great Snow Belt crossover. We've also noted that AWD models have a somewhat less communicative steering feel, and the FX50 AWD feels (and is) hundreds of pounds heavier.