DNA Air Filter X-Max - Iron Max - TricityFit Models: X MAX 250 18 19 X Max 300 17 24 Iron Max 250 19 Iron Max 300 19 TRICITY 300 20 23 DNAs advanced FCd (Full Contour design) OEM Cross Reference B74WE4450000 Filtering Efficiency 98% 99% Increase in Air Flow 41. 67% DNA Air Filter Air Flow 173. 40 CFM OEM Air Filter Air Flow 122. 40 CFM DNA replacement air filters are designed to increase hp and acceleration while providing excellent filtration. These filters are washable and reusable and are