Did you install the grille as it comes out of the box?
I just got mine on monday and I was disappointed to see it is only a fake plastic mesh with little 1/4" drilled holes, especially because I bought it to get more fresh air to the cooler. At least it fits very good into the cars holes.
So it took me three hours yesterday fist to drill bigger holes, then fully open the mesh with my dremel and sand the holes. I also opened e few additional holes. I roughly calculated this increased the area of air-throughput by factor 3.5
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