I'd avoid mesh if you can, as the effect it has on air flow is quite dramatic. Even if, say, 80% of the available area is still open, the mesh has the effect of dropping the effective area significantly, and thus might not do you any favours on track, where cooling is a real struggle.
I'm trying to find a really coarse mesh for the front, as I was stuggling with water temp on track, despite having a fully shrouded radiator, which was extracting as much as possible from the existing meshed opening. I don't want to have nothing there (it's the only hole I want some mesh), as I just know somewhere there's an evil stone waiting to do some damage.
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