Those old vw horns weren't that loud. As I recall, Phineas T. Freak got tired of everyone laughing at his little car that went "bleet, bleet" so he opted for something a bit louder
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Horn wiring is a simple matter. They generally have two spade connectors, one power and one ground. If the vw horn has the same size connectors as your bike horn and you can get one cheap then give it a whirl. Why not, sounds like fun
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