Why bother? Fwiw, the airbox STL modified was a different type. Does it even apply to yours?
Does yours even have a snorkel-like restriction in there? The "airbox" would be that circular plastic shroud at bottom of (& cut off by) your earlier photo. It gets air from this black plastic L-shaped intake tube located under the fender. The "mod" would be to remove a hole-reducing device from between the airbox and intake tube, if it even exists. Does it exist?