Dude. It's good that your trying to think of some new shit to do, but that hole is only there to match the hole on the other side which is there for the intercooler on the 4g cars. The 4g cars don't have those plugs because of this. We have the plugs for whatever reason, maybe cause it's not gonna do shit for the motor, tranny, or anything unless you put boost on your car or have a CAI. If I were you I wouldn't drive around to much with your fender well cover off either. Nothing has changed on your car since you took it off except shit in that area isn't protected from the shit your tires sling up there. If you don't have a CAI or intercooler in there, the only thing you might wanna do it put a tranny cooler there.