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The aFe high flow, oil-free OE replacement drop-in performance filter will out flow Subaru's stock paper filter which results in improved horsepower and torque for your EJ25 powered WRX. The Pro Dry S is composed of two layers of progressively finer mesh synthetic media provide convenience and easy maintenance, plus maximum airflow for superb performance results. Washable and reusable for many cleaning cycles, the tall evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. aFe designed their Pro Dry S drop-in filter with urethane bump seal insures tight, no leak seal over the life of the filter.