Quote Originally Posted by michael_antoi
horizontally...

i just checked. it's not possible to flip it coz it wont screw back on....

it wouldn't be a good idea to remove that lid altogether would it?
OK, then you do the old ford trick... you take out the filter, put it on another flat metal/plastic plate, trace the outline of it with a marker, cut out the metal along the line you traced, drill a hole for the wingnut bolt, put your filter back in the airbox, and tighten it down with the new plate on top of the filter...