I've always wanted to use them because we get alot of gravel dumped on
the roads during the winters and have already found small pebbles
lodged between the fins of the radiator. Also, my car has a
relatively hug gap in the lower bumper area and it's big enough for a
good sized rock to pass through. I'd hate to think what could happen
enxt if one of those fly through the gap.

But my main concern with grille inserts is that they may restrict the
air flow to the radiator too much, thus increasing the temperature in
the cooling system.

I'm looking at Cloud Rider grille inserts with the mesh type. The
size of the holes can be viewed here,
http://members.shaw.ca/steve.lee/tmp/

What do you guys think? Are those holes too small and just might
affect the cooling system operating temp? Thanks for your time and
courtesy.