This is a genuine BMW vacuum pipe, part number 13 32 7 561 060. The number stamped on the part is 13327561060; BMW's catalog files it under the short number 7561060. You will find it on our Air Intake shelf, under Other Fuel preparation and control parts. It supersedes the older number 7503685, so a part carrying that number is the same part.
It fits every E46 body style (320i, 325i and 330i, 2001–2006), with the M54 engine — and the European-market versions.
BMW draws it on 2 diagrams, among them Fuel filter, pressue regulator (13_0904) and Fuel filter, pressue regulator (13_0946). It weighs about 18 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.