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Are you one of the Sonic owners out there who may be searching for a horn upgrade?  A quick web-search will yield a number of aftermarket horn upgrades that one may pursue but I was looking for a plug-n-play horn without all of the trouble of splicing wires.  My question was if there is a horn made by the manufacture for a different vehicle that could be adapted for the Sonic without modification or minimal changes?  My search led me to find that the OEM dual horn for the 2011-2014 Chevy Cruze has the same connector as the Sonic.

The part number for the Cruze dual horn is 95231066 and can be purchased through a number of sources.  Here is a link to just one of many sites which has the OEM horn: GM Wholesale Direct

As with any upgrade please check with your local dealer for any warranty issues there may be and follow ALL safety precautions.  For the instillation, turn the vehicle off and remove the key, then you will need to go through the regular steps to access and remove the OEM Sonic horn.  There are a number of how-to's on the web which will show step-by-step how this can be accomplished.

Now, although the connector for the Cruze dual-horn (95231066) is the same as the Sonic horn (95128275)  the silver mounting bracket for the two vehicles is completely different and will require some modification.  I imagine there are a number of ways one could adapt the mount to work, but here is the way I found that worked.  With the Sonic horn and bracket removed from the vehicle, then remove the Sonic horn from the bracket.  For the next step I loosened one of the bolts for the Cruze horn and bracket and added the Sonic bracket to the back of the Cruze bracket then tightened and adjusted the angle to match the OEM positioning of the Sonic horn.  Lastly, reattach the modified assembly to the vehicle and bend the bracket froward toward the front bumper about an inch or two in order to clear the washer reservoir and reconnect the connector.  Test the horn to ensure proper function and then reverse the steps you used to access the horn.

The images I posted are with the washer reservoir removed to highlight the bracket positioning I used and one with the reservoir installed to show the clearance needed.  You might find an easier or more creative way with your own set-up.  It's now been about 3-weeks since I made the modification and there have been zero issues with it.