All Quickshift filters feature stainless steel mesh on the top plate to further improve the amount of air they can flow. Due to the extremely fine, regular pattern of the pleated mesh, the filter gives less internal air restriction and straightens the air through the filter far more consistently which results in the capability to release more power than other performance air filters. By making a filter totally from stainless steel this gives a unique metallic sound to the car that cannot be replicated by a cotton gauze type or foam filter.