Huge 7-Layer Performance Air Filter:The Momentum GT intake is designed around a pre-oiled, large 8″ Tall round inverted top 360 degree radial flow performance air filter with 5-layers of progressively Finer Oiled Cotton Gauze and 2-layers of Finer Porosity Synthetic non-woven media for  highest filtration efficiency for extreme dust environments. The unique air filter-to-housing interface (patent pending) allows for maximum filter size which increases the available air volume while simplifying the installation process.