[scanspeak]

I've just bought a used 325i 3-stage intake manifold on ebay.co.uk with the intent to replace the 2-stage intake on my 323i.

Power would increase from 140kW to 170kW (230bhp) with a good tune.

I've read lots of threads on the US spec 328i but does anyone here have experience doing this on an Australian 323i (N52B25)?

[Socket]

what is this voodoo you speak of

[Boganian Rubes]

Hahahaha lmao....
That sounds like an awesome increase hope it is so!

[EB89]

I’d say a tune would do more than more airflow, it’s an NA car right?

Also 3 Stage vs 2 stage?

Don’t you just need to filter the air, it’s not compressed, not fuel injected into the intake manifold.

I would be careful what you read, those 328i guys come up with some suspicious number from intake changes...

[scanspeak]

Not voodoo. It's the only difference between a 323i and a 325i.
The mechanics are well proven, the trick will be in getting the mapping off a 325i onto my ECU. Working on it .....

[EB89]

Sounds like a stretch man. But if you are going to do it, get some dyno before and after runs.

[scanspeak]

Mission accomplished!
SouthernBM did the fitment and ECU flash/tune and I have to say the results are very successful. More torque everywhere, just way more fun to drive.
Very happy with this upgrade.

[Socket]

Originally Posted by scanspeak

Mission accomplished!
SouthernBM did the fitment and ECU flash/tune and I have to say the results are very successful. More torque everywhere, just way more fun to drive.
Very happy with this upgrade.

Congrats man. Free power. Nice

[EB89]

Originally Posted by Socket

Congrats man. Free power. Nice

Doesn’t sound like it was free

[dying4004]

how much was it in total?

[scanspeak]

About $2000 parts and labour and tune.

[dli286]

I thought all N52s in Australia came with the 3-stage manifold that consists of 2 DISA valves. Do you have a photo of the old 2-stage manifold? Doe it look like this?

[scanspeak]

It looks the same from the top but on the 323i when you look under the intake manifold you will see it is missing 1 DISA valve. All 325i's have 2 DISA valves.

[dli286]

I see now. Thanks.

Originally Posted by scanspeak

It looks the same from the top but on the 323i when you look under the intake manifold you will see it is missing 1 DISA valve. All 325i's have 2 DISA valves.

[BMOmega]

Originally Posted by scanspeak

About $2000 parts and labour and tune.

Wouldn't it be cheaper to get a real 325 from the start? Rather than 323 +2k?

[scanspeak]

Not really.
The 325i typically costs $3k-$4k more and try finding one with a 6MT, MSport pack, and without IDrive, in your preference of colour.

[Chad053]

Hoping some of you still online, I have the 325i. Was reading this morning that people are swapping the 325 or 328 manifold with the 330 3 stage manifold to get the extra 45hp. From what I gathered, the difference with the manifolds are just the two additional disa valve. I can see both disa valve on my manifold, does that mean I can just flash my car with the 330 whatever flash and I get the extra power?

[shannon1]

Hi Chad053, from what I've read no you can't. I'm sure if I'm wrong, someone will speak up to correct me.

From my understanding:
323 can go with a 325 twin disa valve manifold plus tune to get 325 power.
328 can go with a 330 twin disa valve manifold plus tune to get 330 power.

Th difference is that the 323 and 325 are both 2.5 Litre engines with the same engine and just different intake manifolds and tunes.

Whereas the 328 and the 330 are both 3.0 Litre engines with the same engine and just different intake manifolds and tunes.

Unfortunately you can't do anything cheap and easy to a 2.5 Litre engine to get it up to the 3.0 Litre power or more unless you want to do some serious engine mods.

[Chad053]

Oh I didn't realise the 330i were 3L engines. They have the same N52 engine reference. Thanks for your response mate, will save me doing useless research all day.

[scanspeak]

I think the 330i E9x were only sold in 2006 in Australia.

The 328i is the US spec which came with 3.0l engines. They had a lower tune providing about the same power as our 325i, presumably due to poor US fuel quality or the US preference for more torque..

[Mowgly01]

Originally Posted by scanspeak

I think the 330i E9x were only sold in 2006 in Australia.

The 328i is the US spec which came with 3.0l engines. They had a lower tune providing about the same power as our 325i, presumably due to poor US fuel quality or the US preference for more torque..

Were you able to do a dyno before and after the mod? I've got a 323i as well, based in Malaysia - so similar set up to the Aus version. Thinking of doing this mod.

Anything notable during the process or worth mentioning?

[scanspeak]

No I didnt do a dyno, hoping to at some stage.