B58 Air Intake for F chassis BMW M140i, M240i, 340i, 440iThe ARM B58 Intake isnt just another lookalike B58 intake its engineered to outperform. Featuring full 3. 75 T6061 aluminum piping throughout, it stands as the largest B58 intake on the market, delivering more airflow to meet the demands of stock, tuned, or fully built B58 engines. When paired with the ARM B58 Turbo Inlet, this system forms a complete induction solution that helps your B58 breathe easier, spool faster, and support higher horsepower