Removing the front panels might improve the airflow, but, it'll make the air being sucked into the case warmer.
You ought to try blowing air from the mouth when it's fully open and then with the lips closed wit a small vent between. It'll help you understand the nature or pressure , venting, and air temps.
Though the difference is not that much, but in the PC world every degree seems to count.
Ah!! I forgot to tell you, you need to put your hand in front of the mouth while trying out that test.
High pressure to low pressure and low pressure to high pressure, see's a variation in temps....