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I can almost 99% guarantee that you can block that drivers' side air intake hole without harm. Somewhere on your air intake system, if your cavillac is like the one I used to have, the air is squeezed through a very small opening. Also, it appears that opening is open to the center grille some ways back (not sealed off completely if you block off the front.)
My escort's air intake snorkel has an opening that would be hard to squeeze a half dollar coin through.
I agree with what everyone else has said about the door bumper strips and the upper grill block being better.
Good luck with the car; Welcome to EM, and.....
You should definitely get some instrumentation going; either a Scangauge or MPGuino. Totally worth it and you will be able to see the (+ or -) results from your mods with higher resolution than the gas pump.
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