Air horns for small bike

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Air horns for small bike

Due to my age and health I've downsized my bike to a little Honda 250 Nighthawk, which my hips can handle much better. The thing I notice is that the standard horn isn't really up to it and I've seen bikes (Heard) with air horns fitted which make 'pulling out of side road' car drivers take notice. I'd like a set of these for the 250 but they all seem very large compared to the size of the bike. Can anyone recommend a small but LOUD and easily fitted horn? It would be nice if it was just a straight swap, using the 2 wires already in place, my horn sits between the forks just under the headlight, anyone?
Thanks