Large Five Layer Performance Air Filter:_x000d_This aFe POWER Pro 5R is a 7-1/2 tall, pre-oiled, 360-degree radial flow performance air filter with five layers of progressively finer cotton gauze media for maximum performance. It 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 and/or track use. Its inverted top makes for more filter surface area, resulting in more flow and longer service intervals. Product Features:Dyno-Proven Gains up to +15 HP and +14 Lbs. x Ft. TQOutflows Factory Intake by 35%Measured Flow: 365 CFM @ 7 H2O100% Twill Weave Carbon Fiber Construction