Modern Vespa

I'm the proud new owner of a vintage European PX 200 and I'd like to replace the horn with something that actually has a chance of being heard. I've got my eyes on the Wolo "Mini But Loud" model. And I'm not much of a gearhead, though I'm not entirely inept and do have tools.

My questions:

1) Is this a good choice of horn? Does it fit the PX 200 bracket/wiring without much fuss?

2) Is there a better (that is to say, louder) choice that could be installed without undo fuss (that is to say, drilling into the body)?

Thanks in advance for any guidance,

Shawn

EDIT TO ADD: Worth noting, perhaps: The scooter runs on a battery; didn't used to, but had a mechanic convert it back to original electronics after I bought it.

generally not much room for bigger horns in there. Not sure how that horn compares but it looks about the same size from photos. If you are buying on amazon i say take a chance. Cause if it doesn't fit, you can always return it to amazon easy.