Trail Boss 2001 - 2009, ATP 330, 2004-2005. UNi Filter for Polaris Magnum 2001-2006. Improved drive-ability, horsepower and throttle response. Dyno tested, race proven. Uni NU-8506 ST NEW Production.
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.