Cosworth panel filter, to fit Subaru Impreza 2008+.  Cosworth High Flow Panel Filters are constructed from a propietary synthetic, non-woven single layer, pleated polyester filter media that requires no oiling.  For an OE fit, the filter housing is injection molded from high impact polypropylene.  Each Cosworth air filter has been engineered to fit the vehicles original air box providing a true cold air supply to the engine.  Cosworth Performance filters also provide increased air flow when compared to original equipment air filters.