Outerwears Motor Filters
 

Came accross this by RCCA
The Outerwears electric pre-filters are great at keeping out debris and water. The material filters out particles larger then .005” but shows no loss of airflow.

http://i35.tinypic.com/ng7leg.jpg

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I ran one one of thier covers on my AFE Pro Guard filter on my truck, and I could tell a difference in air flow with it on. FWIW.