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[jsmichael]

I can attest that blowing snow will make its way to the air filter and clog things up. This happened to me last winter. The "Check Air Filter" light went on and I was able to contact my Ford service person who told me what the deal was with the snow getting into the filter box.

After I got home I took the cover off the air filter box and pulled out a bunch of snow. Of course the filter itself was wet, so I pulled it out and left it inside the house to dry. I then took our other car to an auto parts store and purchased a Purolator air filter to use until the Motorcraft filter dried out.

So, if you don't get the Winter Grille Cover, then at least pick up a spare air filter as insurance.