aFe 30-10211 Pro 5R Non-Turbo Air Filter for OER BMW 3.0L Deep Cotton Pleats for Increased Flow Fits In Factory Housing High Flow For Increased Performance Limited Lifetime Warranty Progressive 5 Layer Cotton Gauze Material Improves airflow for better performance and acceleration Pre-oiled, washable/reuseable air filter for long service life with life-time warranty Pro-5 R Five-Layer Progressively finer mesh cotton media for high airflow with high filtration efficiency. Tall, Rounded, evenly-spaced pleats for maximum dust holding capacity Constructed with 100% pliable polyurethane for great seal without use of foam gaskets or sealing grease