These 360-degree radial flow air filters feature our pre-oiled Pro 5R media with five layers of progressively finer cotton gauze media for maximum performance. They provide your engine with the largest amount of high-flowing air, usually resulting in the highest power gains out of all our filter media options. This media is perfect for street and/or track use. Their inverted bullet-style tops makes for more filter surface area, resulting in longer service intervals. The included performance air filters are surrounded by open-element 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.