MAD B58 Chargepipe Upgrade Kit - F / G ChassisUpgrade from the stock BMW Toyota Supra B58 charge pipe to the MAD B58 charge pipe for maximum airflow and reliability! The stock BMW B58 charge pipe is plastic and prone to failure. It's only a matter of time before the charge pipe breaks or cracks. The MAD B58 charge pipe is a strong aluminum piece; it will provide better airflow, 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