BMS M3/M4 S55 Aluminum Replacement Upgraded Charge PipesDescription Upgraded metal charge pipes and j pipe that won't fail BMW's S55 motor is a modern marvel but one weakness we've identified is the boost tubes or charge pipes that connect the turbochargers to the intercooler. Made of thin plastic these factory parts are prone to snapping apart where the flange meets the tube, splitting along the length, and or slipping out of their intercooler couplers. The BMS S55 replacement charge pipes are made from