[DifferentPointofView]

For the grille block, I always thought of a design that used the air to regulate whether you needed to block the grille or not.

You have it hinged on the grille, and depending on what your grille looks like, you have it either laying on the front bumper, or a little rubber bumper. while your traveling at low speeds, or stop and go, you get plenty of air to cool the engine, and since you are at low speeds, drag isn't a factor.

At highway speeds, the incomming air that rushes under the block will lift it in the air, creating a grille block, when you come to a stop, it falls back down on the bumper.

There's a pic somewhere of one way to do it if you have a very deep grille housing. I just gotta find it...