aFe 30-10135 Pro 5R Air Filter for Honda Civic Si 2006-2010 L4-2.0L 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