superhawk airbox internals, the longer runner goes on the rear. Remove the runners to access the screws underneath. Remove those screws as part of the airbox lower removal. Note that hole in the right side (top of photo). I don't know when, or even how this could have happened, but I bet it has something to do with the huge bump in mpg I got a couple years ago when I went from about 30mpg to a consistent 43mpg and never knew why. We'll see...