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I suppose I'd like to ask, what are the goals of your build? Here in the US at least, BMWs have a reputation for being relatively expensive to own and maintain, and an inline 6, though smooth, is never going to be a highly efficient configuration.
Is it to have the lowest running costs possible with your BMW? Highest distance per dollar of fuel? Highest distance per energy content of fuel? Or really just to push the limits of combustion?
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