After further review, you may be correct... it seems that I saw something that wansn't there in the pictures of the Swift... It is in fact 100% behind the car, does not extend past the inner box walls, and probably doesn't do too much to manipulate flow, if anything.
Even given a very extreme angle, it would most likely modulate flow very little, if at all.
*Sinister voice* "Until we meet again, MetroMan!"
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