All opinions are valuable and I do considered all. That's why we are still discussing. Again, Thanks. However, I still like the look of the red car beside the front bumper and the tall wing. Probably because it has 1 color top instead of the black fabric cab. Anyway, my wing is not OEM, although it looks like OEM. It is all fiberclass, no rubber piece. Instead of the rubber piece, it is hollow inside. Paint is beaten up. I do need to take the paint off completely and repaint it anyway. This is why I am thinking of having an opening, not just to fake it, but to have more air into the tail.
Second thought, I can add a piece of aluminum for this opening on the bottom, leave the top alone to keep the aerodynamic the same. How about this, pic on the right. Most probably other people might not even realize the different, hopefully. Of course I will paint the surrounding black after all these opinions.
