Only 328i and 335i sell largely in North America. Everywhere else in the world the 320i and 320d are the bigger sellers. This is due to the emissions/consumption tax. I highly doubt BMW is binning engines for 320i. I do know that the drive shaft is different from the 320i and the 328i. The 328i's drive shaft is larger and can handle more torque. As for the engine differences I do not know but something is changing the compression ratio.
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