I want you to dimple your entire car and write a kick-a$$ report about it so we can
finally put that one to rest! 
This is interesting. Looking forward to seeing which ones you choose.
Seriously: I'd like to see someone do a test of various simple air dam heights (ground clearances), holding all else constant, and see what you uncover. The results would be vehicle-specific, but still interesting. (Everyone else with a 6 would thank you though.)