BMW N54 Black Charge Pipe7B1212 DESCRIPTION The COBB BMW N54 Charge Pipe both increases flow and improves the reliability of your twin turbo BMW. The 3" mandrel bent aluminum pipe replaces the brittle factory plastic pipe which can fail under increased boost pressure. The increased piping size helps to reduce turbulence and maximize flow into the engine. WHY? Free up airflow and improve the reliability of your N54 powered BMW. FEATURES BMW N54 Black Charge Pipe 3" Mandrel