I have zero concerns with overheating, I run a vinyl number plate on the front wing so no number plate box, and if anything my deeper and far more efficient SiFab aluminium radiator over cools.
Anyway, once the air has entered past the grill and is in the void between it and the rad, it only has one place to go.
Horns or no horns, all that air has got to pass through the rad
Dave.
