Have you inspected the horn itself? These are typical 2-tone baffle horns and if your horn seems very quiet or produces nothing more than a muffled Hummm the diaphragms and actuators may rusted away or you could have had mud wasps or other bugs that found those baffles and crawled inside and made a nest out of the inner spiral chambers. Without hearing what they sound like and how loud they are I can't tell if you just love loud horns or if your OEM horns are not performing to spec. My stock horn on my 2004 is loud enough... loud as any typical car horn.