[R. Scott]

Every Harley is delivered from the factory with mufflers that quiet them to tolerable levels.

Because of the California laws. After market pipes may be louder, but they help the engine breathe better and give more horsepower.

[FunkyZero]

That's fine, but when the testosterone challenged sit outside my house in a residential neighborhood during my baby's noontime nap and sit there and rev the damn thing for the sake of showing off, I'm going to get out my wrist rocket and attract some attention of my own. It really pi**es me off.
I'm a freak motorhead and audiophile. It is true, the sound inside is far different that what you hear on the outside. What rattles mirrors on another car sounds so beautiful on the inside, done properly. Anyone who has ever enjoyed Dire Straits Sultans of Swing on a properly balanced system knows exactly what I'm talking about. However, be courteous enough to turn the damn thing down when you are sitting at stoplights or near crowds of people. Not everyone shares your enjoyment.