N54 Charge Pipe MAD BMW 135 335 OE DVUpgrade from the stock BMW N54 charge pipe to the MAD N54 Charge Pipe for maximum airflow and long term reliability. The factory BMW N54 charge pipe is made from plastic and is prone to failure under increased boost pressure. Its only a matter of time before the stock charge pipe cracks or breaks especially on tuned vehicles. The MAD N54 Charge Pipe replaces the weak factory component with a durable aluminum design that improves airflow, reliability,