Iv just purchased another box because I went too wild with a blade.
Personally I would run the OE intake that comes from behind the headlight.
Then take a hack saw to the box.
Open it up around the intake, about 3 ribs per side (you'll see what I mean).
This will open the box up to breath more freely, but still allow all the airflow from the OE intake. It also sounds good.
Don't drill holes anywhere else, it will just draw in warm air.
The standard box isn't restrictive as such, but sucking what it needs from behind the headlight is.