These 360-degree radial flow air filters feature our oil-free Pro DRY S media with three layers of synthetic media for maximum convenience. Their progressive layering provides great filtration efficiency and dust holding capacity, while not requiring the use of oils. This media is best suited for street use. Their inverted top makes for more filter surface area, resulting in longer service intervals. The included performance air filters are surrounded by open-element red XLPE polymer (cross-linked polyethylene) housings that minimize warm engine air for maximum performance. The open design allows for easy viewing of the air filters and delivers an aggressive Air Intake sound. They utilize the vehicle's OE air inlets with no additional hardware. This system features high quality, computer-designed, dyno-tuned intake tubes to achieve maximum power gains while maintaining a perfect fit. Their XLPE material is heat soak resistant and extremely durable. The computer designed system utilizes factory mounting locations, minimizing the use of unnecessary hardware and ensuring a perfect fit every time. Its innovative design makes for a hassle-free, direct bolt-on installation process that requires no cutting or drilling. It features our patent pending filter-to-housing interface that uses half the number of parts of a traditional cold air intake system.