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K&N X-Stream Top Filter X-Stream 14 inch OD Black fits_2021-2021`Polaris`RZR BladeRunner Turbo Inlet Manifold GMK&N XStream Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your engine all the air it can use. They are washable and reusable just like other K&N Air Filters.