Spectre's Aluminum Air Shield for 4 inch flange air filters was designed to shield the filter from heat resulting in cooler incoming air and more power. This shield was designed to fit the majority of cone shaped filters with a maximum base diameter of 6.5 inches and a length up to 11 inches. Manufactured from high quality polished aluminum, Spectre's air shield is easy to install under the clamp used to secure the filter to the intake tube.