Barracuda factory exhaust cut-out ????

I'm no expert on the FS cars, but I believe that if that cut-out valence was factory-installed, that the car came with the "Super-Single" exhaust system, which were FS cars.

Check the fender tag on the car. I believe there's a number on there that denotes "FS" build.

Hopefully, an FS expert will chime in.