This is a video comparison of a 2005 Yamaha FZ6 stock horn, and a STEBEL Nautilus Airhorn. The STEBEL is mounted in the same location Boneman had his (Boneman's FZ6 Site - STEBEL Nautilus Horn), in the left dash/fairing.
YouTube - 2005 Yamaha FZ6 stock horn vs. STEBEL Nautilus Airhorn