>Breaks up the low-frequency sounds ("exhaust rumble") and turns them >into high-frequency sounds ("chirp!"), which are then better filtered out >by the car's insulation. Chirping cars are quieter inside! It would follow that cars that do not go "chirp," but instead go "blap," like mine does, are quieter *outside*. (!) This is not the case. I know it. My neighbors know it. Idle passers-by know it. Maybe we all have inadequate insulation. ;)
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