No matter what you think, my story about loud pipes.
Riding one day to work, minding my own way and in my lane, I come by a merging area (on my right) and I see a white Mercedes speeding behind me on the lane that was merging onto mine. Just as I see it on my right, I see the driver, a lady talking on a cell phone. Obviously she didn't see me or hear me. She starts moving to her left, onto my lane and into me. I was flanked on my left and had other cars ahead and behind me, so no place to go. Instinctively I revved the engine so she can hear toe 'loud pipes'. She did hear them, almost dropped the cell phone and she moved back into her lane, waited until both I and the car behind were ahead and then proceeded moving. I am convinced that doing the 'loud pipes' thing saved my skin.
Are there obnoxious Harley riders with loud pipes? Yes. The pipes they use are called drag pipes and they are less effective than stock pipes. They are mostly for effect (noise). But one can't say for certain that the old adage 'loud pipes save lives' is not true. I am living proof.