It's not near as bad as it was in my PT Cruiser.

Vent Guards may help a little, especially if your just cracking the windows a bit for fresh air.

Is anyone selling vent guards made SPECIFICALLY for the FIT?

Does anyone have vent guards yet? How do they look?

 

I agree, it happens in almost all four door cars, but if you want to really blow you eardrums try it in a Dodge Durango, their back windows go all the way down and at 65mph you'll lose your mind as well as your ears.

 

By "vent guards" do you mean what others are calling window visors? If so, there are a couple of alternatives. Honda has some, but the ones I like are the Mugen.