it's clear why this is done
It's a cost cutting measure, why have another engine with different parts when you can use the same engine across multiple models (20i & 30i) with simply software change.
The modular design already cuts a LOT of cost but going one step further to combine 20i & 30i engines makes a LOT of sense given the 20i isn't even available as a trim level in some regions (there is no 320i in the united states as far as I know).
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