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Street riding instead of racing, but Energica motorcycles aren't quiet. While they're not loud compared to slip-on exhausts, they're definitely louder than stock exhaust when accelerating or decelerating. They have a distinctive sound, and people tend to take notice so I think it really helps with riding safely on the streets.
With regen, i've mistaken my own Energica's whine for police sirens after accel/decel/accel/decel : - )