1999 Model Year Vehicles have a build date prior to 1/99 (the build date of the vehicle is located on a tag inside the driver's door) and are equipped with a catalytic converter.
1999.5 (early) Model Year Vehicles have a build date prior to 1/99 and are NOT equipped with a Catalytic Converter. The intake manifold inlets measure nominally 2-inches diameter.
1999.5 (late) Model Year Vehicles have a build date of 1/99 or later, and are NOT equipped with a catalytic converter. The intake manifold inlets measure nominally 3-inches diameter.
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