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Thank you for the excellent photos and directions. I replaced by 2018 Outback horns with FIAMM El Grande's. I could not take the nut off of the horn as it attached to the bracket so I took the bracket and horn off by removing the bolt securing the bracket to the frame. This worked out just fine as I used the supplied brackets with the El Grande horns.

FIAMM includes a small brass adapter that allows you to place the adapter in between the horn and bracket to pull the ground from the frame to the bracket/adpater. A simple patch ground cord with two female end plugs was all I needed to attach the ground plug of the horn to the adapter. I did not change the relay.
 

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What about adding a second set of El Grandes to boost the volume? At least on the passenger side there's plenty of space. I'm so much happier with the sound of the FIAMM horns.
 
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