I have 3 horns hooked up right now. 2 Hella's and 1 OEM. It's pretty damn loud and the multiple frequencies
blend together in a harsh buzzing honk. It's not that it's a whole lot louder than stock, it's just that you don't
expect that sound to come from that Subaru
.
Also, 118 dB for Hella Supertones is spot on.
Personally, my favorite thing is how they look in the grill.