FISA
Some see novelty horns as something of a, well, novelty; playing out funny tunes whenever the driver presses on the horn to alert people of their presence. Completely road legal, of course, but most commonly found at car shows; FISA horns are a fun addition to a car to announce your presence to the world. Attached quickly and easily to the existing system, FISA horns are a small addition to a car that can make a massive impact and ensure that everyone takes note of you and your treasured car.