Actually the HD after-market parts are more guilty of reducing visibility of motorcycles than the Japanese liter bikes. We know, factually, that loud pipes do not save lives, but that seems to be the thing that people rely on for safety when the reality is that we need to be SEEN.Very true especially with the rice rockets.
Loud pipes are NOT heard by people who are about to turn left in front of a bike. Loud pipes are heard by people behind the bike, not people in front of the bike. Yet most multi vehicle accidents are caused by people who turn across the right of way of a bike in front of the bike.
Added front facing auxiliary lights ARE seen by people who are about to turn left in front of a bike and
The crotch rocket kids tend to actually light up their bikes with undercarriage LEDs, wear bright colored jackets, have bright colored bikes, and helmets that are actually visible. They just tend to ride like total idiots and, according to accident statistics, tend to kill themselves or get into accidents due to reckless riding.