These RB N54 High Flow Oil Drains have been designed to allow all N54 Stock Frame Style Turbos (RB, Pure, VTT, Hexon, OEM, etc) to have utmost ability at effective and efficient draining. OEM lines are known to develop kinks and internally collapse (many times during servicing), which can lead to smoking issues caused by the consequential poor draining ability of the line. This is compounded by varying diameter ID's (Inner Diameters), which are well undersized for proper oil draining. The RB Oil Drains have been designed with straight flow paths directly from the turbo oiling outlet directly to the oil pan, while maintaining a consistent large diameter ID (Inner Diameter) to ensure optimised draining.