Does anyone know the laws/rules on exhaust noise here in georgia?

The other day i was driving as a cop passes me, i see him turn around. He comes back behind me, then we pass a state trooper or something and he follows me too. They both pull me over. The first cop asks me if i live on blah blah road, which i do, so i say yeah. He pulls out a printed letter with the description of my car in it saying that people/person have called in complaints about my exhaust being too loud. First of all I work nights so i leave for work at 11pmish and return at 6:30amish... He tells me my exhaust is illegal by state code so I asked him how it was illegal? He returned by stating that he could just give me a verbal warning or he could write it down for me... I opted for verbal warning and to shut the fuck up until i knew the laws...

So, my exhaust is sorta loud, it's not a ricer nasty loud but a deep rumble loud, kinda like a GT rumble... Imagine a gt with flows on it... WTF?? Can anyone point me to the state code where it states these laws or something? I wana shove it back int he cops face next time and tell him to eat it...