My neighbor has complained about my stock pipe as well (18 M4 CS). I used to have a C63 with 6.2 V8 engine before, which I consider to be a lot louder, especially during cold starts. I simply ignore her.
Being stock and following all regulations, any restraining rules would also apply to all vehicles, so your neighbor does not stand a chance. Just get yourself a good lawyer, and keep the cameras on all the time.
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