QR Code Link to This Post 7 Twin Air air filters used in good condition. Twin Air filters retail for $31 a piece, when I bought them new it cost me $217. At $40 your cost is about $5.71 per filter. Will fit a 2013, 2014, 2015, 2016 crf 450 or a 2014, 2015, 2016, 2017 crf 250. Located just North of Wayland.