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we need to differentiate btw the Asia/Europe vs North America mkt
E90 325 differences
In Asia/Europe, we are lucky to get this award winning N52B25 block
In NA, they get the detuned N52B30 block also giving the same power
Key diffferences; Asian N52B25 shares the
same components with the N52B30 in the 330, which means
multi-stage intake manifold(3 stage to be exact), hollow camshafts, ECU(compression), exhaust and tranny. The only difference is the boresize.
Now by removing the above goodies from the N52B30 and replaced with the single stage manifold and etc.... you get a N52B30 pumping out 40 horses less, equivalent to an Asian N52B25 ...
Using the same strategy, removing all the these items from the Asian N52B25 , you get the 323 N52, again pumping out 40horses less...
Отсюда: