Reading through this topic is quite interesting. I have the 28i and have also wondered about tuning.
However, if all of the parts etc are exactly the same between the 20i/28i, why can't the 20i simply be tuned, theoretically, straight up to whatever the 28i can be tuned to? There should be no reason why this is not possible.
I have a sneaky suspicion that there is more to the larger 28i engine than BMW are letting on.
I'll be keeping an eye on this post with interest though.
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