Or, the neighbors could grow up and not harass their neighbors for having different tastes than them. You aren't harmed by a little noise for a few seconds. If somebody is working on their car at 5am and constantly revving the engine over and over then maybe you have something to complain about. Just idling a car for a minute, backing up to turn around and then driving away is perfectly acceptable even if it's a little loud.
I can't imagine the police would actually cite somebody for something like that unless the car had no muffler or some other problem.