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      01-24-2013, 03:33 PM   #322

Drives: F10 N52B30@255PS
Join Date: Sep 2010
Location: Hong Kong

iTrader: (0)

It makes it far more complicated than it is worth it, especially given the ground assumption that inherent differences are very, very small, say in the 1% range.

It's more logical for BMW to fit different turbos and cooling (as mentioned b4) so that increasing the output of the 20i without changing these components is not recommended.
Probably less than 1/20 20i's sold will be chipped so BMW would just let these guys have the free lunch that only costs them what 4-5k USD and they don't have to mess around with different components to spite the knowledgeable DIYer.