i can assure you that it is not the grill that limits airflow, there is no way a case fan is pushing things to the max. all you are going to do is get your fingers caught in the fan. i really dont think it would help you
I was thinking this myself actually...
Would it be worth doing it to the Antec 900, and what tools can you use?
And what would be the significant difference between a honeycomb and a punched out one? A wide open one always works better.
How bad does 27 C at idle sound with a room temp of about 75 F?