MAD N55 Charge Pipe BMW M135 M235 M2 335 435 RWD OnlyUpgrade from the stock BMW N55 charge pipe to the MAD N55 charge pipe for maximum airflow and reliability! The stock BMW N55 charge pipe is plastic and prone to failure. It's only a matter of time before the charge pipe to break. The MAD N55 charge pipe is a strong aluminum piece; it will provide better airflow and won't fail, and fits like stock. The MAD charge pipe retains the BMW C clip and O ring for the best fitment. Do not forget to move them