vg injectors usually don't clog they usually corrode and don't fire after you take the plugs off LOL, you gotta clean all the green shit outta em before they fire again.
if i had your car at my shop i'd check the egr valve/egr vac switch/exhaust temp sensor/etc to see if it's functioning and or if the egr passages are clogged, THEN i'd most likely condemn the cats LOL. if you don't know how to check the egr system msg me.
another thing that can cause nox to soar is if you don't have a thermostat. your car will never reach operating temperature but usually the nox'll be like 3000-4000ppm
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