They need to be wired up separately anyway. You can't just drop it in place of your old horn, doesn't work that way.
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200dB? That would kill everyone that heard a train horn. Lol. More like 130-140dB. Nah, it'll run separate with a momentary switch near the stereo for easy access when someone cuts me off. ^_^
Anyways, may be getting some cash soon. Selling some of my old PA stuff so I will be getting a Whelen siren, probably one Dual Pro, and either two Slim-2's or an LED directional bar. This will all be a while yet though.