Once you remove all the fittings holding the stock box on, just carefully wiggle and nudge it out. On the bottom of the airbox is just a compression rubber fitting that will just pry out. Just be careful.

Here is where you need to look at my ghetto diagram. You have to relocate one of the lines b/c you are going to remove the entire section in yellow. Look at the red circles. That is where you unclamp things. Follow the blue arrow, that is where you are going to relocate the hose to. When you relocate, you'll lose a bit of coolant, that is why you need a cold engine.

At this point that hose assembly is totally removed from the car.

See Diagram.