[freebeard]

The conversation is already in the weeds.

OP is only nineteen and this is their first post. (Hi again. Did you lurk much?)

I can't find a picture, and it's torn out of my example; but the Audi 80/Passat/Dasher has an offset radiator and should have a sliding fiberboard panel in the radiator ducting that was apparently controlled by a wire cable. A variable grille block if you will.

As important as some blockage is a proper bell-mouth intake and well-thought out venting (back corners of the hood vs wheelwells).