Originally Posted by maxcichon
I think Jim is talking about the "airfoil" on the back of the horizontal slats in the grill. As far as I can tell, they are only there to prevent one from looking through and seeing the radiator. He removed the horizontal flow restriction and made a clear path to the air intakes.
Am I right, Jim?
actually I think they are there to prevent stones from damaging your radiator. but they do inhibit flow for sure!