Another possible advantage of bumper openings direct into the filters of the Stillen Gen 3 intake is the fact more air volume might make it in, especially when you consider the ram air effect.
With regards to the water, perhaps the bumper inlets could be at the same height as the intake (like Mine's), but more inboard, not in front of the intakes. This would allow (given enough space behind the bumper) for a U shaped pipe with a drain at the bottom to connect from the inlet to the intake filter. That way water would only make it through the first half of the U, and not be able to move up (at least not a significant amount) the second half.
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