This is a genuine BMW intake manifold, part number 34 51 1 091 049. The number stamped on the part is 34511091049; BMW's catalog files it under the short number 1091049. You will find it on our Brakes shelf, under Mechanical-hydraulic components.
It fits the E36 sedan, coupe, convertible and touring (318i, 320i, 323i, 325i and 328i, 1992–1999), with the M40, M42, M43, M50 or M52 engines — and the European-market versions.
BMW draws it on the Hydro unit ABS/ASC/control unit/support (34_0382) diagram. It weighs about 7 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.