Originally Posted by lt1silverhawk
I have a strong feeling it is because of emissions that it was kept (it is California, after all). But then the only issue is, this truck is missing an EGR valve and the intake doesn't have the provisions to install one.
Not having an EGR valve is common w/the larger truck series. So even though the aftermarket intake was bought w/o one, it probably didn't have one originally. Considering how everything else seems to have been retained that had to do w/emissions, it would have been easy to replace the intake w/an EGR-equipped version if the engine had an EGR to begin with.
You should be able to determine whether an EGR was necessary when the truck was made by checking w/the emission refs or possibly online. You will probably have to go by the gross vehicle weight.