For generations the K&N brand name has been associated with quality and reliability. Give your MS3 a breath of fresh air with a K&N drop-in replacement filter specifically designed to increase performance and fuel efficiency. The K&N 33-2293 is custom designed to fit into your Mazdaspeed3's existing factory air box, so installation is quick and simple. In addition to their unmatched reliability, K&N also backs up their filters with their Million-Mile Limited Warranty for added peace of mind. K&N filters are washable and reusable, so this filter will actually pay for itself over the life of your Mazdaspeed3.