Buy a 2006 Victory Vegas with custom pipes. The volume of the system itself is not audible in a full-face helmet; the sound of the wind and the bicycle overwhelms it. But when I picked up the phone and called, the person said they could hear me just fine, and it didn't sound like I was cycling at 60 mph. The volume on the phone is at maximum and I could hear it. enough to understand them. Music can also be heard at maximum volume. I'll leave it for phone calls, but it probably won't be loud enough when communicating between bikes. EDIT: Music on, volume on max, sound level recorder and my phone's mic about an inch from the earpiece. You can see the results.
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