This filter features three layers of oil-free synthetic media and requires no oil during maintenance to provide maximum convenience. Its progressive layering provides great filtration efficiency and dust holding capacity. This media is best suited for street use. Pro DRY S filters are easily recharged with aFe's POWER CLEANER. The unique IRF (Inverted Replacement Filter) design utilizes the depth of the OE airbox, providing maximum surface area, airflow, and performance, all within the stock filter housing. This system features a high quality, computer-designed, dyno-tuned intake tube to achieve maximum power gains while maintaining a perfect fit. Its XLPE material is heat soak resistant and extremely durable. Stainless-steel worm clamps and silicone couplings are used for strength and durability.