DNA Air Filters - Stage 2 Air Filter Cover Combo for BMW R 18 20-23 / Kit ComboThis filter features DNAs Stage 2 COMBO Kit, specifically designed to eliminate the OEM intake snorkel on BMW models, resulting in enhanced performance and a more aggressive intake sound. Key Features: Performance UpgradeThe Stage 2 COMBO kit is engineered to replace the stock plastic air box intake cover. When used in combination with the DNA Stage 1 Air Filter (P BM18CR20 01), it significantly boosts: Airflow Filtering efficiency Power Torque