Large Five Layer Performance Air Filter:_x000d_Momentum's innovative filter-to-housing interface was built to feature the largest air filter possible. This 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 use. Its inverted top makes for more filter surface area, resulting in longer service intervals. Product Features:Dyno-Proven Gains up to +10 HP & +16 Lbs. x Ft. TQOutflows OE Intake by 29%Measured Flow: 650 CFM @ 7 H2OWashable and Reusable Pro 5R Air Filter for Maximum Performance