Yep, this horn is physically large. I had to make a mounting system for it with a grounding clamp (the kind you use to ground electrical outlets to a water pipe or ground rod in old houses) and a piece of aluminum bar. It fit behind the right side fairing on my V-Strom with a little work. Once I got it in, I crimped some spades to some wire, put the (included) relay where my old horn was, ran a fused lead to the battery and life was good. The wiring kit might have been nice, but it wasn't hard to make my own.This horn is literally loud enough to cause hearing damage. I ride with earplugs, so whatever... but when I had someone trying to harass me while I waited for a light, leaning on the horn button got him out of there pretty quickly :) It also works quite well for the usual purpose of letting car drivers know they're about to merge into you.The claimed rating of 115dB at 6' is 1000 times louder than the standard 85dB (at 6') disc horn most motorcycles come with. I believe it.