VRSF Chargepipe Throttle Body O-Ring BMW N54 N55 S55VRSF Chargepipe Throttle Body O Ring BMW N54 N55 S55 A worn or damaged throttle body O ring is one of the most common causes of boost leaks on N54, N55 and S55 BMWs. This is the genuine VRSF replacement O ring for the chargepipe to throttle body connection, designed to restore a proper seal and eliminate that leak for good. A small part that makes a real difference. ModsDirect supplies this part to BMW enthusiasts across Australia as an authorised