- Shape: Rectangular - Height: 1.50" (38 mm) - Outside length: 8.438" (214mm) - Outside width: 5.25" (133mm) - Flange: No - Upgrade replacement for OEM 29331-04 air filter element. K&N is the world-wide standard in high-end quality performance air filtering systems. Made from multiple layers of pre-oiled woven cotton gauze material that is mesh screen protected. They are washable and can be used as stock replacement. Filter elements are designed with a ribbed surface that will give you up to 5 times more filter area than a regular replacement filter; dramatically increasing airflow. K&N filters decrease service intervals; are better flame resistant and will last much longer than comparable foam or paper type filters.