4.00" Yellow Universal Cold Air Shortram Intake Round Cone Foam Filter + 3" 3.5" Reducer Filter consisted of 2 layers to double the filtration efficiency Overall Dimension: 3.00" Filter Outlet; Intake Inlet 3.00"/3.50"/4.00" Micro cotton gauze type filter material, washable with water or soap, and reusable Designed to increase horsepower and acceleration, High air flow with excellent filtration Direct fitment, easy to install