The 2011 Infiniti QX56 combines a 400-horsepower 5.6-liter V8 engine with Infiniti’s VVEL (Variable Valve Event & Lift) and Direct Injection Gasoline (DIG™) system with a refined 7-speed automatic transmission – providing a 25% increase in horsepower and more than a 10% increase in fuel economy versus the 2010 QX. The new QX56’s towing capacity is rated at 8,500 pounds for both 2WD and 4WD models.
I found a little on the internet about the QX 56 engine but not enough to tell that it is or isn't a whole new engine . I would bet that the cost and time involved to try to add the direct injection and VVEL to our Titans or Armadas would be more than a turbo or super charger system. I am sure these new additions will come with the next Titan.
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