Fuel pump for sure. In other non-BMW platforms, we're going 2x easily larger in terms of injector size. I bet the pump should get an upgrade if doing injectors.
That said, E85 is also very very temperamental. Meaning, the quality of the gas can vary a lot based on moisture content. E85 sitting, absorbs moisture faster than gasoline.
Cars that are driven daily, this is not an issue. Cars that could sit for a week or two, or for an entire season, this is an issue. This goes for the station itself too...
For the hardcore track junkies, they have a 55gal barrel and their own hand pump to fee their car, only after measuring for water content.
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2012 X5 xDrive35i Sport Activity - Alpine White - M Sport Package
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