I am probably the only one who wondered about this, but...

I crawled under the rear of a Roush Mustang to see how the rear Valance is made / attached -

Seems that they rough cut out the rectangular exhaust tip openings into the stock bumper cover and then apply the Roush rear Valance. So it is not a mod that can be undone without replacing the entire rear bumper cover.

 

looks like it to me too...ugly i might add.
like the wing, hate the bumper.
the inserts in the rear bumper look like something you would see on your dash to hold your pens and change.

 

The wing does not bother me so much - I like it a little after seeing it in person.

But the bumper pockets remind me of the steps you see on the president's limo that the Secret Service guys use when they ride along.