You plan a "custom aerodynamic roof rack" Will you tell us more about that?
You can try fabulousing up boat tails for the posts. That should negate most of the aerodynamic penalty of having roof rails, although I am not sure how it would look. Perhaps you could shape foam to fill in the space between the rail and the roof and then boat-tail that.
How low does the factory air dam go? How much do you like the window deflectors?
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