Why not DRIVE the car instead of just letting it idle, lol.
My neighbor 30 homes away does that...has a loud ass 1960's Camaro that even once warmed up seems not to like anything under 1500 rpms.
Disburse the whole area. People must have really ***** cause 3 years ago it was very very loud, then it was just very loud, now this year its just loud.
I run 4 mufflers --two on each pipe to keep my ride quiet--I back out of my driveway at 700 rpms nice and mellow after 20 seconds of idle....and my car is quicker to boot.