Basically .... the wide narrow bit (bottom left of the pic) sits at the front of the car under your front bumper. You can see a couple of holes that would allow you to cable tie it in place. Ducting (you know, like you see coming out of tumble dryers) fits on to the circular bit on the other end (top right of the pic) and should be directed up through the engine bay to direct air at your filter. Note that you may need to cut a hold in your under tray (depends on the car really).