Yes. The cam is one of the main choke points on a 03+ truck. You have swapped the turbo out already, as it's the 2nd main choke point that is used to meet emissions.
The HPCR 5. 9 cam has the most intake and least exhaust of any cam put in a ISB in a Ram.
Between the cam/turbo my motor is so smooth and loves to rev now. Before even at no load it sounded like it was working hard and hated rpms, now its smooth and easy all the way up.