These are sold at toyota dealers as upgrade, they are factory installed on all lexus brand models
But
They are short lived. Ive thrown out a lot of these and installed fiamm ones. Customer wont pay for 100 dollar horns.
My favorite are the 4 tone horns GM used in their old barges, like old caddys, 4 separate horns making 4 separate tones, sounds like business. But defeaning, so much so if you blow it near a graveyard you may see corpses throwing rocks at you.