Sedan,18 inch,3.23diff,manuel gearbox,chip.This upgrade is the best that you can do for your 323i. Fuel consumption is beter. Gasrespons is beter everything is good!

I think If you mount a m54b30 manifold you will lose torq at low rpm because the ports are bigger and very different than the m54b25. 2.2 and 2.5 are the same manifold even the injectors are the same with (tub) engines and the 2.2 2.5. The m54b30 is everthing too much different, is too big for a 2.5 engine.

Maybe for the 328i a m54b30 manifold is the best option??? I don 't know but for the 323i the m54b25 or m54b22 intake is the best i thing. Sow i am very happy. Thank you for watching!

Greetings from the netherlands!

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