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I bought one of these. Works excellent and is much cheaper than Harley's. Fits in the same slot as the Harley one but isn't the same size. I put a dab of silicone adhesive on mine before I put it in to hold it in place and aligned the speaker with the factory speaker hole. They also make this same one with dual speakers but the single speaker version is plenty loud.
this isn't a bad thing. but the reason why it is so much cheaper than the hd version is that it isn't as loud, and it doesn't have a battery backup. that being said, before radio shack went out of business, i built my own for less than $10 and ran it for 7 years before trading that bike in.
Would be simple enough to wire up a relay on the siren leg to also power the air horn. True, the air line could be rather quickly ripped off, and most people ignore a car alarm, but it would make a heck of a racket.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
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