Yes, the Fiamm horns that are used on the RT. I, too, was startled the first time I hit the horn button on my RT. I think that the RT uses standard auto horns. The way they are mounted in the fairing throws a lot of the sound back at the rider, but they are still pretty darn loud. Just got a working pair of used horns. Just need to figure out a way to mount them on my S.