Don't be upset by Frank. He's a nice fellow, but often dry and witty humor can come off harshly. He's also pretty wise and a good opinion to help if your question is specific.
I will share my experience; my air dam resulted in overheating of my car, even with a massive hole in it. The solution? Belly pan, especially between the bottom of the air dam and the bottom/sides of the radiator. I think my air intake was dumping straight down instead of going through the radiator. So I recommend doing both if your airdam is very extreme. If it's just a small block of part of your grill (your cars are nicer than mine), you can surely do one or the other.
Welcome to EM! Make sure to use the search function and you will find lots of information from the past 2 years, and if you haven't already, introduce yourself in the introductions forum.
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