Ah the horns! They don't like to be pressed for more than 20 secs though or POW! goes the fuse!

 

You need to check out Agranger's air horn setup. He has an actual Train airhorn mounted under the Mini where the left muffler used to be. Painfully loud.

 

What size are MINI fuses? I'm too lazy to look. You may be able to buy breakers to replace that fuse. Semi's use breakers that appear to be the same size as standard fuses. I don't know what they cost but it's a whole lot easier than replacing blown fuses everytime you lay on the horn.

 

Are there any other plug & play options aside from those $70 hellas?

I'm looking for something louder, but not as loud as the air horns, as fun as they would be...

 

Agranger used them in a tunnel in the Great Smokies when we did the morning drive. Good Lord, I thought a tour bus was going to run us down! We asked for it, though... within 2 milliseconds of entering... honk, honk, honk, honk, LOOOUUUUUD BLAAAAAST!!!!!