noise ordinances are often about sustained noise for longer than a few seconds, constantly above a certain decibel limit. you're likely to find that construction, large vehicles, and other things nearby are as much of a nuisance from a measured standpoint.
If that were true, towns would not have "No compression brakes" signs at the town limits. No one wants a loud ass Harley ridden by wannabe outlaw bikers waking their baby up at 2:00 a. m. That's one reason noise tickets are written (though not nearly often enough) for those with open pipes.
