I doubt it's a change that will show up in testing. But you can do it just for the satisfaction of doing it. People talk about air-damming down to the lowest point but the crossmember really doesn't impede much, maybe a little venturi effect as the air passes under it. I'd be more concerned about overall flatness.
4" is about the limit if you encounter bump strips. I run 3 1/2" to the off-center tow hook and have to approach bump strips at an angle to rock the car over it.
What does it have for wheel spats?
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