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 YZ450F 2011-2013