Hi Peter, have you tried radiator cooling plates? I am actually thinking of giving them a try since they focus the air coming from the grille and bumper into the radiator..
I'm thinking that aside from the top, I could add plastic plates on the side and bottom of the bumper and these would funnel the air into the radiator...instead of the air passing through somewhere else...
Would this result in more drag though or would it be cleaner aerodynamically?