I installed a inexpensive 12 voltair horn. The whole project cost $25.00 .I used existing holes in h3 for mounting.
Its much louded then stock horn but not as loud as the horns your looking at.
Link to 12 volt air horn install
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H3 gray adventure,brushguard,hood handles,sunroof,steps,crossbows,smokers package,window/sunroof visor,Airbrushed spare tire cover,mudflaps,K&N filter,SS Hummer insert,Hummer rubber mats,cargo rubber mat + shade,12 volt airhorn,eclipse nav/dvd/rear camera/mini remote,autostart,12 volt fridge,high beam garage remote,underhood air compressor, taillight bezels ,clinometer ,trailer brake and hitch.
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