Superior air filter technology denso is one of the world"s largest suppliers of air filters. Denso"s units are specified by many major OE manufacturers. Why are denso"s units so popular among OE manufacturers? Because denso components are built to meet the stringent requirements of carmakers throughout the world for quality efficiency and durability. Now available in the aftermarket, denso first time fit air filters are the product of over 30 years of engineering know-how. Our air filters combines our engineering superiority, premium component materials and everything we know as an automotive systems manufacturer which delivers you the highest quality line available.