Porsche insists on using these type clips on the bumper vents and I have not found a way to remove them without destroying them.

What are these clips called? Are they porsche specific? Automotive specific? Or are they generic and available elsewhere?

 

I believe they are called "speed nuts".

 

they look just like the one's on the turbo grills except there's only 1 of those per side.
I put a screw driver into each side L/R and turn. I've reused mine multiple times.