Question about cutting a hole in the air box

['91 240sx]

I know its been asked many times, I searched and searched but couldnt find what I wanted to know. I know all about taking out the Y-pipe thing and the box thing behind the drivers side fender, I was just wondering about cutting the hole in the intake box itself

What part of the box should I put the hole on? I know the bottom half but should I put it on the side that faces the front of the car or the side that faces the bottom? Also how big of a hole should I make, sorry if this was all already asked but I couldnt find nothing when I searched

[240sxrunner]

just cut it all off about 3 1/2 inches below the filter then you have all wide open air filter its the best cheap mod

[89240sx]

cant you just attach the air filter to the top half of the air box instead of cutting it up?

[thelinja]

Why don't you just use the two holes yielded by removing the Y-pipe and the other pipe leading from the airbox to the resonator. It doesn't make any sense to me to cut a hole when there are already two there for you.

[240SXd00d]

Or, for a little money but less than a full CAI, buy a cone filter, remove the airbox and attach the filter to the piping from the intake manifold. You make your own short ram air filter.