[freebeard]

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?