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When it comes to keeping heat and unwanted debris entering the filter, the enclosed or boxed filter system offers the most protection. Manufacturers took the idea of a filter in a box and modified it. Geniuses that they are, they reduced intake restrictions on the air intake duct and filter box by rerouting and increasing the diameter of the new air duct. This seems to work extremely well, especially when driving off road where all kinds of water and debris can get in and choke your filter.