I also installed the PIAA horns some months ago. They come in two versions I have the ones with the lower frequency. To be honest I expected a louder sound from these horns. They are definitly better then the stock horn but still I would like them louder.
I bought them at 4 wheel parts in Dallas. I forgot the price but I believe about $50 and by the way easy to install.
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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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