Ok, maybe a dumb question, but why is this here? I don't really need to carry around 15lbs of pine needles and a dead mouse or two, so I'm thinking of capping it with silicone and sheetmetal, then putting the grille back on to make it pretty....
My truck has been thoroughly molested (Chevy firewall!), so maybe there used to be air vents or something there?
Not even close to mine ↓