I see "upgraded engine" in various threads, but don't see any specifics. Does someone know how this new 3.6L Pentastar V6 24V VVT Upgraded Engine compares to the current V6? Does it have more horse power.? Does it have more torque? Is it more fuel efficient? I understand it has been "strengthened" for ESS, is ESS the extent of the upgrades to this "upgraded engine"?