Here's what mine looked like on a good day. Most of the time they were plugged solid. Once plugged they are very difficult to clean out and end up plugging again very quickly. I drilled as many 2" holes in the panel as I could but never had the panel cut out completely. If I remember correctly, the instructions advised against it. My dealer, who recommended them in the first place, thought that might help but I elected to go back to battle tested 2cool vents instead. Yes, they will ice up too but not nearly as quickly and when it does accummulate, a quick tap and off it comes.
View attachment 94109
View attachment 94108