K&N crankcase vent filters are designed for racing. Shield and top plate are chrome-plated for beauty and durability. Nylon reinforced adapter plus a 3 inch outside diameter x 2-1/2 inch tall filter. Universal mount, requires a 1-1/4 inch inside diameter hole, and a 2 inch square, flat surface. Comes complete with mounting hardware. Note: Legal in California only for racing vehicles which may never be used, registered, or licensed for use upon a highway. See knfilters.com for CARB status on each part for a specific vehicle. Note: Legal in California only for racing vehicles which may never be used, registered, or licensed for use upon a highway. See knfilters.com for CARB status on each part for a specific vehicle.