Hi, I actually installed the PIAA horns. We expected a deeper sound than it actually is. There is some work to get to the horn but it should not take more than 10 minues. You can take the grill off by removing some bolts between the 7 bars and on top of the grill under the hood and the rest around the headlights is with clips. (it is some months ago and I don't have the car here at this moment otherwise I would check)
I was thinking about installing an airhorn as well and use a swith inside to switch between the regular (PIAA) horn and the airhorn.
Eric
Black H3 adventure
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2006 Hummer H3 Adventure, Black with Cashmere Interior, PIAA Horns, SMA Heavy Duty Brush Guard, FlowMaster 50 Series Delta Flow Exhaust
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