I've no personal experience with the Soundbomb, but I am already planning on installing a Hella Supertone in place of the stock horn. The Supertone is a disc horn just like stock, and while I think it'll be a little wider in diameter, making a slightly larger bracket shouldn't be an issue. The Supertones are sold in pairs which are tuned to a dissonant interval so as to be more "annoying" when you sound them, but you can run just one of them without issue. I mounted one on my old BMW a long time ago and it's been great. They're rated at 118 dB, which is nice and loud.