if you’re willing to mount the little compresssor and horns (under hood), there are a lot of (good and LOUD) options—but it sounds like you’re wanting to avoid that (me, too)
I farm & ranch for a living. When we feed our cattle, we call them into the feed ground(s) by honking the horn. My grandfather started this many, many years ago; and as you know, tradition tends to run deep.
There are neighbors that use sirens & other gadgets to call their cattle, but we still use the horn.. we used to go thru a LOT of OEM-type horns, as we use it a LOT on feed days. We still wear a horn out far more quickly than the ‘average consumer’, but oh well... our cattle know it’s me
I found this to be a good replacement, and it’s ~considerably~ louder than OEM. I’ve found it to last a good while, especially under the paces we put it through:
https://www.amazon.com/Wolo-419-Bad-...161809&sr=8-11