TWIN AIR Flame Retardant Air Filter (for Powerflow Kit 153909C) - 153909FRThanks to their patented conception and their high quality raw materials, Twin Air filters warrant the best performance and protection for your motorcycle. Thats why EO manufacturers and the best riders of the world choose Twin Air. Fire Resistant air filter for the Powerflow kit 153909C Coarse open pore foam catches airborne dirt, grime and sand Fine open pore inner foam acts as a second filter to trap the smallest particles while ensuring maximum