well,I had a big cardboard box and some metal coat hangers that weren't getting any use, so I turned them into the rear weighed shutters I have been messing with. Slapped them on my car and they look and work pretty good so far. My temps stay where they should and after attaching a webcam to my car I was able to see that the shutters are opening and closing properly. The only problem that I am having is that they shutters are closing at about 25mpg, while I would rather them close around 40-45mph, but the cardboard setup cannot support the added weight
I really need to find some coroplast. I've got the itch to get this thing working, but am too cheap to go buy the stuff.
Here are some pics of how the shutters look on the car. I personally think they look pretty stylish. When I make the switch to coroplast, I will do a better job on the fitment to eliminate the gaps I currently have and I will also spray paint them black.
P.S. uploaded from phone so no license plate blocking here
(you saw NOTHING!!)