I have made my my 2018 Tiger 1200 XRT ROAR with a very LOUD horn instead of 'meeping' with the feeble factory kitten-horn.
I installed a set of the PIAA 'Slender' horns up under front fender. You can't see them without getting down under the fender. The fender won't hit them. They mount on existing bolts. No relay required as they draw only 5 amps. ECU is fine with it. I've installed these also on Yamaha FJR1300 and YZF-R1 years ago with zero problems, so they do last and work well.
So, ATTACHED here is a PDF doc I whipped up with all the details. Happy honking!