it rains here lots too. Havent had trouble with it in the rain, but i got some water on the filter when i was washing the car and it overheated. fine after that. In the winter, just turn the filter to face forward.
in the s14, you dont have to move the battery. shouldnt have to in the s13 either.
as for leaving in part of the stock filter box, why? chances are, the stock pipe is smaller and would be restricting airflow
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