I once bought a vintage 1959 6 volt fog horn for $12. It was loud as hell. We tried hooking it to my friends 69 chevelle to scare some people with, since the car had no horn.
Sadly the 12V burned it up faster than expected. :'(
Skyler
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-1989 Saleen Mustang #406-TFS Heads, E-303 Cam, Edelbrock Intake, and more.
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