Installed Mixo TR99 in my Corolla Altis before i had Bosch EC6 which got busted after 1yr.
These are OEM in Volvo. Also got a pair of Klaxon TR98 for my cousin's Pajero.
One of my friend has collection of horns, Fiamm, Mitsuba, Denso, Hella, Seger, Bosch etc he doesn't sell em he just keeps them in his wardrobe.