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Have you looked at where the cabin air exits first. If air cannot freely exit the cabin then its not going to be the most efficient system either way.
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i assume that your custom tail does not generate much "vacuum" behind the car, but still it might be worth looking for a place in the back where there's lower pressure than the cabbing an make a movable vent there. or prehaps a forward flipping spoiler like door that creates it's own suction behind it (there will be hot air sucked out of the cabin so in theory this could actially redude drag, or at least cancle the induced drag out).
other than that i'd vote for a naca duct... maybe in the roof?