I couldnt stand having a stock horn. I spent $100 bux on it, but its fully chromed, metal horns, quite a bit larger than those el-cheapo plastic deals. I've had a set of the plastic 3-tone setups too, but these beat the pants off em:
It makes waves in traffic, and will send nearby pedestrians into heart-attack mode. The packaging claimed 125dB, but I have no way to confirm that.
Definately not like a train, or a semi truck's DEEP sound, but loud enough. If that doesnt suit you, check out:
HORN BLASTERS
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"I know that you believe that you understood what you think I said, but I am not sure you realize that what you heard is not what I meant."
http://www.cardomain.com/id/88delta88