Up for sale is UNI 2003-2008 Trail Boss 330 Polaris MULTI-STAGE COMPETITION AIR FILTER. The vendor part number is NU-8505ST. Please read the title to know what is for sale Designed to fit in the factory air box exactly like original filter The best selling replacement air filter for competition motorcycles and ATVs Unique two stage design allows for easy and complete cleaning Dual layer of foam, can be serviced separately Thin Ultra Seal base is virtually impossible to tear and has a built-in "Grease Groove" Used by factory Yamaha, Kawasaki and Suzuki off-road
The instructions for soaking the filter in oil were a bit confusing. I couldn't understand if both sponge elements should be soaked, perhaps a picture with the filter. Otherwise will test it and it appears well-made and good quality.