CENCAL B46/B48 BMW Charge Pipe Kit (F&G Chassis)Cen Cal B46 B48 Aluminum Charge Pipe Upgrade from your factory plastic charge pipe to the Cen Cal B46 B48 Aluminum Charge Pipe for maximum airflow, reliability, and long term performance. The OEM charge pipe on B46 and B48 powered BMW and Supra models is made from plastican inherent weak point that can crack or fail under increased boost pressure. Our upgraded aluminum version eliminates that concern entirely, offering both improved durability and