Yes, today is my day in court. And what law did I break? Well, I'm glad I asked that question. Here courtesy of Cleveland City Codified Ordinances is the violation:
473.20 Muffler; Muffler Cutout; Excessive Smoke, Gas, or Noise.
This in a part of the city where you stop at a light and sometimes you can hear what's playing on the stereo in the car next to yours than what's on your own.