CNG/PROPANE GASEOUS ENGINE PREP PACKAGE - 98Fhardened engine intake valves, valve seats and bi-fuel manifold, Note: This package does not include CNG/propane fuel tanks, lines, etc, Vehicle will be equipped w/the standard factory gasoline fuel system, Additional equipment combined w/certified calibration reflash is required, from an external upfitter, to convert the vehicle to a CNG/propane fueled vehicle, See Alternative Fuel Buyers Guide: www.ford.com/altfuelbuyersguide, Ford Motor Company does not provide an exhaust or evaporative emissions certificate w/this option when converted to use CNG or propane fuel, Ford does not represent that a vehicle converted to use CNG or propane will comply w/all applicable U.S, or Canadian safety standards, It is the responsibility of the final stage manufacturer (body-builder, installer, alterer or subsequent stage manufacturer) to determine that any vehicle converted to use CNG or propane complies w/U.S, Federal, California or Canadian exhaust and evaporative emission requirements, Federal fuel economy standards, U.S, and Canadian safety standards, labeling and any other requirements