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 POWER CLEANER and blue air filter oil. Constructed of 4-ply reinforced silicone, this intake tube is resistant to cracking and hi-temp conditions. With a smooth interior surface, this tube upgrade is engineered to increase horsepower, torque and airflow by reducing turbulence. Stainless-steel clamps for strength and durability.