This filter features five layers of pre-oiled cotton gauze media to provide maximum performance. Its progressive layering allows the filter to flow at high levels even when dirty. This media is perfect for street and/or track use. Pro 5R filters are easily recharged with aFe's POWER CLEANER and blue air filter oil. 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.