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 YFM350 RAPTOR 2004-2007 2013 YFM350FX WOLVERINE 4WD 1995-2005 YFM350R RAPTOR 2WD 2008-2013 YFM350X WARRIOR 1987-1988 YFM350X WARRIOR 2WD 1989-2004 YFM600 Grizzly 4WD 1998-2001 YFM660 GRIZZLY 2002-2008