K&N 16in Spun Aluminum Top & Bottom PlateThe oversized K&N 16 inch air filter top and base plates can be paired with a variety of 16 inch K&N air filters for boosting the performance in carbureted race cars. The plates are made from lightweight aluminum with a spun aluminum finish featuring K&N logos embossed on the outer edge of the top plate. The base plate fits carburetors with a 7 5 16 inch air horn flange and drops the filter 1 1 2 inches below the carb flange. The drop base design