The aFe MagnumFLOW Air Filters OER PDS A/F PDS BMW X5 xDRIVE 35d 09-11 L6-3.0L (td) is a performance air filter designed specifically for the 2009-2011 BMW X5 xDRIVE 35d. It is constructed with two layers of cotton gauze and a progressive, oiled synthetic media that provides maximum airflow and filtration. The air filter is designed to increase horsepower and torque while providing superior engine protection from dirt and other contaminants. It is also designed to be easy to install and maintain.