IT seems like it would have the same effect while driving with the fender liners. While air is heading in and down to the intake, the hot air that it displaced would have more freedom to exit the engine bay.

I could see how, at idle and while not moving, the heat may not have a way to to up and out of the hood through the scoop. But still, that scoop isn't doing a damn thing to bring in air when you're not moving forward anyway. Right?