Say hey in a big way from a small source. AFI sings in with the Drop-in Hidden Horn. The compact electronic horn, about two-thirds slimmer than its predecessors, booms out 111 decibels of sound for unbeatable attention, whether you need it for navigation, safety, or a nice and loud "ahoy!" The Drop-In Hidden Horn, measuring 1 inch deep, can go just about anywhere. It needs just one hole saw cut in 2-3/4 inch for installation. Prices start at $35.