You have to cut it on the wing side and front ONLY. You can either cut an area out of it, or get a drill out and drill holes and amke it look like a swiss cheese. Make sure though you ONLY drill the lower half of the airbox, drilling the top half would mean you have to buy a new airbox. You HAVE to drill below the line of the air filter, and make sure you drill only wing side and front. The trumpet is the small 90 degree angled "trumpet" that runs from the front of the airbox to the inside of the wing, simply remove it with a screw driver or you might need to drill it out.