Check out this needed upgrade for your XP1K or XP4 1000. This Desert Molding Concept OEM air filter replacement is reusable by tapping out the loose dirt, then blow it out from the inside out. There is a few great features about this filter… For one, it hose clamps down and bolts to the air box instead of it just popping in and sitting in there. Also it is reusable as mentioned earlier, and breaths better than the stock filter, and you can also use the Outerwear that fits the factory air filter.