NO TOIL manufactures the world's best 2-stage foam air filters. Using only the best flame-laminated dual-layer foam bonded with the highest quality glue they hand make each foam filter to stand up to the roughest and toughest riding or terrain. NO TOIL filters can be used with NO TOIL biodegradable clean in water cleaner providing the best air filtration system in the world. Fits: Yamaha YFM400 KODIAK 2003-2004 YFM400A KODIAK 2X4 2003-2004 YFM450 Kodiak 2003-2004