There are also four screws at the bottom as well. kinda have to feel for them.

 

There is a number of push clips on the leading edge. They go into the bumper support rail. So you can get ot without pulling the bumper, but your hands need to be tiny.

For the Record, this guide is part of the OEM cooling system. The box on the front of the radiator is smaller in the front, and larger in the rear. This is the part that completes the top section of that box. It effectivly lowers the pressure of the incoming air. The OEM airbox directs the air that passes through the radiator downwards and out under the car.