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Most of the dual Fiamm and other brands have cheap looking mounts but they seem to hold up well.
There is also Stebel and I think this brand has an air horn that has two trumpets, clear hoses to the compressor which is a bit smaller than a beer can. Both Stebel and Fiamm have dual tone/dual unit electric horns. Each unit is about the size of an average fist. I've used them all and all of them will scare most drivers out of your way. If you are in their blind zone, which is too easy to do in commuter traffic, and they start to move over on you, blast away. These things sound like a large truck. Far more effective than loud pipes. Loud exhausts are so common now that everyone is accustomed to them and the sound is just more background noise. A random truck horn gets everyone to check their position. However, with a/c and loud stereos you still need to have a finger on the brake lever.
These are the same horns used in the Mini Beasts.
We have them on our bikes (Mini Beasts) and they are LOUD and work/look GREAT ! http://www.thepropad.com/c-3-air-horns.aspx
Rob ......
Here's a shot of my SG with Rivco air horns installed. They look great, IMO, and are loud. Compressor mounts neatly in cubby hole under seat in front of battery.
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