[projectJT]

How different can they really be if both blocks are N52? Has anyone with a 330 used an exhaust manifold with cats from a 328 or vice versa?

http://bmwfans.info/parts-catalog/18407545308

This shows that the 330i exhaust is the same as the 325i, which means it was only in production for 1 model year...

Thanks!

[neilvan]

The later part number supersedes the earlier one. Same part; bmw just updated the part number

Edit: Interesting aside, the latest revision # includes the F25 X3 w/ the N52 engine

[projectJT]

Ohhh got it thanks. Usually, when I use realoem for my E30 it'll say "ENDED" and include a replacement part number, if available.

[neilvan]

If you are looking for a factory exhaust manifold upgrade, some euro countries have different ones.

Depending on emission laws there there are some(instead of the log style manifold) that have shorty heaters with the same cats, and some with shorty headers and smaller cats

[Revoluti0n]

Originally Posted by neilvan

If you are looking for a factory exhaust manifold upgrade, some euro countries have different ones.

Depending on emission laws there there are some(instead of the log style manifold) that have shorty heaters with the same cats, and some with shorty headers and smaller cats

I've swapped the exhaust manifolds on my N52B25 with exhaust manifold from N52B30 330i euro spec (my car is 325i euro spec aswell), everything including O2 sensors is direct swap, fits like factory. No tunes whatsoever, I have no issues, no check engine lights, no rough idle etc. Checking fuel trims/vanos etc. on INPA everything is perfect. The car feels more powerful, and definitely makes more power, as I've compared the before and after accelerations. No dyno runs, however to prove it. I did a DME software update a few months ago, however that should not be related to the exhaust manifold swap in any way. Attaching images of the old and new manifold. Also, forgot to mention, the cats in both exhaust manifolds are in good condition.

[NZE90]

Originally Posted by Revoluti0n

I've swapped the exhaust manifolds on my N52B25 with exhaust manifold from N52B30 330i euro spec (my car is 325i euro spec aswell), everything including O2 sensors is direct swap, fits like factory. No tunes whatsoever, I have no issues, no check engine lights, no rough idle etc. Checking fuel trims/vanos etc. on INPA everything is perfect. The car feels more powerful, and definitely makes more power, as I've compared the before and after accelerations. No dyno runs, however to prove it. I did a DME software update a few months ago, however that should not be related to the exhaust manifold swap in any way. Attaching images of the old and new manifold. Also, forgot to mention, the cats in both exhaust manifolds are in good condition.

Which is the 330i ones? Bottom ones?

[Saico]

Do you guys in the US get the ugly ones?

[Revoluti0n]

Originally Posted by NZE90

Which is the 330i ones? Bottom ones?

Yes, the ones on the bottom are from 330i

[NZE90]

Originally Posted by Revoluti0n

Yes, the ones on the bottom are from 330i

Thanks. I'm installing a cylinder head from a 330i onto my 325i n52b25 so i will be installing a set of these or headers as well.

[Brian86]

I will admit... the 330 manifolds are a lot sexier.

[neilvan]

Originally Posted by Brian86

I will admit... the 330 manifolds are a lot sexier.

The bottom one is Europe only; North America only got the first pic; For all N52 engines

[Revoluti0n]

Originally Posted by neilvan

The bottom one is Europe only; North America only got the first pic; For all N52 engines

I can confirm, as when I was looking to buy those from the second pic it took me probably 1 year to find them with extensive search. Even in Europe not all 330i cars are with them, for example UK cars are with the ones from the first pic and as far as I know all 325i and 323i cars regardless of the region are with the one from the first pic, so they are not something you see regularly.

[NZE90]

Originally Posted by neilvan

The bottom one is Europe only; North America only got the first pic; For all N52 engines

Interesting. Realoem lists my n52b25 car as having the same manifolds as a 330i but they are the same as the top ones in the photo.

[NZE90]

Originally Posted by Revoluti0n

I can confirm, as when I was looking to buy those from the second pic it took me probably 1 year to find them with extensive search. Even in Europe not all 330i cars are with them, for example UK cars are with the ones from the first pic and as far as I know all 325i and 323i cars regardless of the region are with the one from the first pic, so they are not something you see regularly.

Yea it seems like that is the case. US versions have a different type again. The ones on my car are listed as fitted euro 323i, 325i and 330i. Do you know the part number of your new ones? It's stamped on them.

[Revoluti0n]

Originally Posted by NZE90

Yea it seems like that is the case. US versions have a different type again. The ones on my car are listed as fitted euro 323i, 325i and 330i. Do you know the part number of your new ones? It's stamped on them.

Unfortunately, I cannot confirm what the exact part number is, as they have been on the car for quite some time now, but I think it's those:

18407568613 for 1-3 cyl
18407568614 for 4-6 cyl

Again, I cannot confirm, I know for a fact that on the catalyst 7530587 was the number.