There are two thick rubber bands that hold down the airbox. One is up near the front on the engine side of the box and the other is round the back. A wire coat hanger bent into shape is helpful for removing these if you can't get your hand in there. Just snag it and pull, there is a plastic lip that they are holding onto and you need to stretch them a bit to get over this lip. You'll see it all when you look.
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