Just installed these in my single horn Festiva. Was a pretty easy install. Splice the dual horns into the single horn wire and each horn has it's own ground. Drilled two holes in my passenger fender well and installed them between the fender and engine bay.
Here is the video I made to demonstrate the new sound. I never had a working stock horn so I don't know how loud it was, but I imagine the Wolo dual tone horns are considerably louder.
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