Exchange catalyst — a genuine BMW part, number 18 32 7 789 040. The number stamped on the part is 18327789040; BMW's catalog files it under the short number 7789040. You will find it on our Exhaust shelf, under Other Exhaust system parts. It supersedes the older number 2246928, so a part carrying that number is the same part.
It fits the E46 sedan, coupe, touring and compact (318d, 318td, 320d and 320td, 1998–2004), with the M47 or M47N engines.
BMW draws it on the Diesel Catalyst (18_0322) diagram. It weighs about 4.5 kg (9.9 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
