Momentums innovative filter - to - housing interface was built to feature the largest air filter possible. This 7 - 12 tall 360 - degree radial flow air filter features our pre - oiled Pro 5R media with five layers of progressively finer cotton gauze media for maximum performance. Our Pro 5R media provides 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 andor track use. Its inverted top makes for more filter surface area, resulting in longer service intervals. The smooth one - piece sealed housing, constructed of heat - resistant cross - linked polyethylene (XLPE), features our patent - pending filter - to - housing interface. Its innovative design resembles the original Miata logo and minimizes the total number of parts used. A large, clear sight window allows for hassle - free filter inspection, without having to disassemble your system. An auxiliary air inlet can be used, or closed with a supplied plug. 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 clamps and a silicone coupling are included for strength and durability, while also providing the most secure installation available. This Momentum intake utilizes factory mounting locations and is designed with fewer parts, making for a fast and easy installation.