Most of the splash that gets in the grab holes runs down the back of the airbox to the well without touching the filter. The splash that gets in the top front corners ends up on the filter. Tape or seal these up with rubber and grip glue. Cut the foam for the well. Replace that Dzus fastener on the door with an M6 bolt and a clip nut so it doesn't pop open and your good to go.
Its wet here too in spring, with some deep crossings. My friend's son has my old '03 EC250 and its still going strong.
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