REPLACEMENT AIR FILTERS FOR THE NO-TOIL SUPER-FLO KIT Do you want to modify your air filter cage and remove the backfire screen to maximise airflow You need a No Toil flame-resistant air filter! The foam is specially treated to resist flames and sparks will not hold a flame AND more importantly you get more horsepower! Note: The Super-Flo Flame Resistant filters can be used with an original cage but care must be taken to ensure that all traces of the original gauze have been removed to avoid ingestion into the combustion chamber). Fits: Yamaha WR400F 1998-2000 WR500Z 1992-1993 YZ125 1989-1992 1994-2009 2011-2020 YZ125X 2020-2021 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