[driverman]

This site seems to decode your VIN for you, including whether you have N51 or N52.

http://www.bmw-z1.com/VIN/VINdecode-e.cgi

[smellthebeans]

Originally Posted by SteveMD

He was trying to get a job with BMW. Maybe he got it and is forbidden from posting. Maybe e is posting under another ID??

Maybe he was silenced by the CIA?

[miacona]

Originally Posted by E90Fleet

This table may help aswell:

The table mentions the n51 has a second generation water pump. Does anyone know the specific advantages of this pump over the n52 pump? Any difference in longevity?

Also this tables references the n51 as not having the 3 stage intake. Can anybody please shed some light on this subject?

[Darkhard]

Originally Posted by miacona

The table mentions the n51 has a second generation water pump. Does anyone know the specific advantages of this pump over the n52 pump? Any difference in longevity?

Also this tables references the n51 as not having the 3 stage intake. Can anybody please shed some light on this subject?

Idk why but I got a 328i e90 with n51 engine with the 3 stage intake manifold and it's original. I'm pretty curious about that & I saw and another forums that they mention about the diference between n51 & n52 and they says that n51 have the 3 stage Intake.

Look here: https://www.e90post.com/forums/showthread.php?t=1038108