Sorry if this is a repeat but:
Loud bikes do not necessarily save lives. Most situations where a bike is in danger is when you are facing them, directly next to them or in front of them (they are attempting to pass you). If you notice, all of these situations result in the exhaust pipe (where the sound comes from) being faced away from the car in question. This means the sound is SO muffled that it doesn't matter to the actual car in danger of hitting you.
It may help in some situations but more often than not it's just a nuisance.
Loud bikes do not necessarily save lives. Most situations where a bike is in danger is when you are facing them, directly next to them or in front of them (they are attempting to pass you). If you notice, all of these situations result in the exhaust pipe (where the sound comes from) being faced away from the car in question. This means the sound is SO muffled that it doesn't matter to the actual car in danger of hitting you.
It may help in some situations but more often than not it's just a nuisance.