Helping you get the most out of your stock air box the No-Toil Super-FLO Kit makes eliminating the back-fire screen a breeze. This gives the air a more direct line to the throttle body improving your bike's performance. The Super-FLO Kit comes with a back-fire screen- less cage a pre-oiled flame-resistant filter and a sweet new filter screw. Features: Made of flame-laminated dual-layer foam bonded with the highest quality glue to stand up to the roughest and toughest of any style of riding or terrain Fully open-cell structure for highest airflow and maximum protection. Heavy-duty glue provides protection from all solvents. Wide soft sealing ring for extra protection. Flexible seams prevent cracking. Original OEM sizes. Fits: Yamaha YZ250F 2014-2018 YZ450F 2014-2015 2017 YZ450FX 2016-2018