K&N drop-in High-Flow air filter for 2019–2021 Mazda 3 2.0L is a reusable, washable replacement designed to install directly into the factory airbox. The layered, oiled cotton media is engineered to improve airflow while capturing contaminants and is covered by K&N's no-hassle lifetime limited warranty; the filter is intended to provide long-term service and is cleaned and re-oiled rather than replaced.
K&N 19-21 Mazda 3 2.0L L4 F/I Replacement Air Filter