All Direnza Cold Air Induction Systems are supplied with a high quality, cone style air filter; designed to replace the OEM airbox, offering more surface area compared to the standard filter. Direnza air filters are manufactured from premium grade, washable cotton, ensuring long-lasting performance enhancements. ---Designed to replace the OE setup, providing up to 50% more filter surface area to help maximise capacity ---Engineered to help the 2.