Bingo
@crash68. I liken it to the truck having asthma haha
Some guys reported a slight efficiency gain reflected in MPG - my brick of a truck and driving style makes me believe I will not see that but just knock out some of the lag in spots. Regardless it will breathe and I have ZERO remorse about purchasing it for that fact. So for the OP, I think you are getting the raw facts here to make a proper decision.
All that said based on airflow stats, I will not replace the air box and filter. Plenty of air moving through there right now and I don’t need to make my engine louder. I know it’s a diesel and I don’t need everyone on the road knowing it haha.