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 WR250 Z 3RB 1991-1993 WR250 Z 4JW 1994-1997 WR250Z 1990 1998-2002 YZ125 1989-1992 1994-2009 2011-2020 YZ250 1988-1996 1998-2008 2011-2015 2017-2020 YZ250F 2001-2007 2009 2011-2013 YZ400F 1998-1999 YZ426F 2000-2002 YZ450F 2003-2007 2009