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: Honda TRX300 2WD FOURTRAX 1992-2001 TRX300 4WD FOURTRAX 1992-1998 TRX400 4WD FOREMAN 1995-2003 TRX450ES 4WD FOREMAN 1998-2001 TRX450FE FOREMAN 4X4 2002-2004 TRX450FM 4WD FOREMAN 2002-2004