The five cerulean five-pointed stars arranged in an X pattern centered in the white band represent the five nations of the former Federal Republic of Central America (El Salvador, Costa Rica, Nicaragua, Honduras, and Guatemala) and the hope that the nations may form a union again.
Wind Deflectors let you enjoy cool, fresh air without all the noise and swirling winds, so you don't have to be so quick to crank up the air conditioner. Plus, deflectors improve your vehicle's open-window aerodynamics, cutting down on drag for a more efficient ride.
Vapors, water or gas tend to amplify sound frequency. Fact. But the dog, depending on it's size, makes an excellent noise barrier. You don't by any chance own the Barrier Terrier breed of dog do you. This would explain the phenom. You probably did not realize it's noise dampening effect, because it is slowly growing up.