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sorrow six. While my knowledge of this is limited and I don't want to be combative My theory logic is the opposite. The bumper will only cause increased drag until it is FILLED with pressurized air. once that happens (micro seconds) it will from then on behave like a solid object. ie think air dam. when you add the holes you are letting this "bubble" escape and now the DRAG of air through the bumper will now persist and not convert to acting like an air dam which my butt sense says is lower drag than the holes.
for an example of this (I have NO tested this and I could be dead wrong on this but my gut says its so) take a CUP aim the open end into an airstream measure the drag.
take the same cup and CAP the end of the cup and do the same thing.
I think you will find the "drag" to be very similar is not slightly lower than the cup without the cap.
now take the open cup and drill holes in the bottom and add STUFF inside the cup (to represent the bolts frame brackets etc.. in the bumper.
now measure the drag. I think you will find the stuff cup with closed bottom will have far less drag than the stuff cup with closed bottom. Because of the closed bottom the stuff in the cup becomes irrelevant to drag. once you allow the passage of air it becomes relevant.
at least thats my gut check take on it.
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