S&B is know for making quality cold air intake kits. They also manufacturer quality replacement filters specifically designed to replace the filter on their aftermarket cold air intakes. These are made with two styles, or filter material. Their most popular is their cleanable cotton oiled filter. This filter type can be cleaned and re-oiled many times for years and years of use. For an oil-free experience, choose their disposable dry extendable filter. These are called extendable because they can be cleaned once or twice with compressed air, then thrown away the third time the filter element is too dirty for futher use. 

All S&B replacement filters are made in the U.S.A. The oiled filters can be cleaned using S&B's proprietary Precision II Cleaning and Oiling Kit, part number 88-0008. Oiled cleanable filters come pre-oiled - just take them out of the box and swap with your current S&B cold air intake filter.