These puppies are loud! I have never liked the sound of a stebal, kinda like a kids train at the park. This set sounds like a 70's model V8 car.
I chose the PN 85110 400/500HZ (lower or deeper sound). Amazon has them at $45.35 shipped at the moment. That price fluctuates as high as $55. I caught it when they went back down to $45.
Per the wiring schematic in the OEM service manual, the horn is on a fuse all by itself (10AMP). The stock horn is listed at 2.5 amps per the book. The PIAA is around 5 AMPs for the pair per this post on the FJR forum.
If the OEM switch in the handlebars can handle the doubled current as other here have had great success, everything should be OK.
I bought the following connectors and did not cut into the stock wiring at all.
Mounted the splitter connectors to the 1st horn in the OEM location.
Plugged in the OEM connectors to the 1st horn in OEM location. Made 2 jumpers to come off the 1st horn and go to the second. I mounted horn #2 just behind #1 as shown. I had to remove the splash cover from horn #2 to make it fit. This should not get much spray where it is located anyway.
Also, I don't care for the flashy decals they plastered all over the horns so I used a heat gun to soften the adhesive and removed them.
A few shots after putting the fairings back on.
Here are the connectors I picked up. Advance Auto was the only parts store (out of 4) in my town that stocked the 90 degree connectors. O'reily's stocked the splitter connectors.
Very pleased with the install and can go back to factory in minutes should I want to sell the bike.
Lastly, I brought my wife into the garage to show her the horns and give her a nice loud blast. She said "Damn those are loud"!
No more road runner "beep" "beep"