Powertrains for the 2006 Infiniti FX35 and FX45 have been carried over largely unchanged. The 2006 FX35 soldiers on with the same 24-valve, 3.5-liter V6 that generates 280 horsepower at 6,200 rpm and 270 lb.-ft. of torque at 4,800 rpm. But in the FX45, horsepower from the 32-valve, 4.5-liter V8 has climbed to 320 at 6,400 rpm and torque is now rated at 335 lb.-ft. at 4,000 rpm.