^ I've got an area-p full system: it just falls within the legal db limit here. Cars do seem to notice me on my bike. I often have people noticing me and reacting to my presence. I'm pretty sure they hear me. I don't rely on that extra road presence: I always assume people haven't seen me. Still nice to have it though.
I do try to keep the revs low when passing through residential areas at night.
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