I found that my neighborhood has a bunch of middle aged car enthusiasts who dont mind noise. They are all very respectfull of the rules put in place in the neighborhood. then there is that one young guy who likes riced out hondas who after being warned a few times eventually fell in line as well sorta.
Needless to say an exhaust note is not something anyone gives a crap about unless you are being a douche and its a private residential area. The only guy to ever get some sort of talking to by the head of the community was the honda guy because he was running a small business modifying cars from his garage which was illegal and people got sick of every fart can equiped rice rocket flying through the neighborhood during test drives rather than being respectful and taking that nonsense elsewhere.
Otherwise like I said nobody cares. Good example is the guy who has his race car in his garage that he works on. So long as you cut the noise out by 9pm everyone is happy and civil about it. They understand people have their hobbies.
But just in case there is that one person that might be sensitive/easily bothered in the morning I am kind enough to crawl out of my driveway without waking the neighbors. The SPT cat back creates enough noise that I am sure someone would notice if I was being inconsiderate. It also helps that I have only one other house between mine and the entrance to the community so the distance is short.