when will you kids learn?
Its a waste of time drilling the filter box as the standard air intake is the same size as the outlet to the engine.
So you cant get any more air in unless you increase the size of the thottle butterflys, (Throttle bodies).
All drilling the airbox does is give a nicer sound.
You will only get an inprovement by rerouting the standard air intake hose by the way of an extension hose to a more frontal position (i.e behind the small grill under the bumper line).
This gets nice cool, dense air, directly to the engine without wrecking the filter box and not giving out any more noise than the standard set up.
The only reason the standard air in take is where it is, is because it picks up less dust, sand etc... behind the headlight or from the inner-wing (this depends on year).
If you modify it like above there is a small chance of sucking up more sh!te (Leaves, dust, small Mammals........etc) so shortening the life of your filters.
What are you? ex-Nova drivers?
Jesus!