Yep, these are the famous Hella Supertone Horns. Transform your horn from the Road Runner "meep meep" sound to "German autobahn blaster" sound.

Hella says:

Supertone horns are particularly suitable for extreme conditions since they have a greater penetration force on account of their size and more powerful electrical drive.

Greater penetration force? That's what we're talkin' about! Kit includes two loud car horns, relay, mounting hardware, and instructions. You supply your own wiring and spade connectors.

Hella Supertones are universal and can be installed on any car.