Upgrade 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 forget to move them from the stock charge pipe to the MAD option. The MAD charge pipe comes with a meth bung; sealed. If you do not intend to use methanol injection, keep it closed. Features: Better airflow More robust material (aluminum vs. plastic) Meth bung Lifetime warranty on defects and fitment 90 day return period All orders ship in 1-2 business days Spot on fitment Fitment: G Chassis: 2016+ 540 2017+ 640 2016+ 740 2017+ X3 M40 2017+ X4 M40