Bought the Stebel Nautilus Compact Mini Air Horn, and the Denali (SoundBomb) harness/mounting kit (plus their mounting bracket, when I first bought my 2018 RT (Wethead) and was exploring options. That was the path others reported taking. However, I also recall for RT's with the alarm system (and...
I've installed over 20 Stebel airhorns on mostly BMW sport bike and G/S restorations and rebuilds. From a performance perspective, you can't ask for a better life saving upgrade to a motorcycle. Easy to install and it flat out works to keep the cages from crushing you.
BUT
The physical design...