He/she should have also written a number on the ticket, which showed exactly which law was broken. For most, it's a number like 523.20 or something. If that's the case, look up the exact law he says you broke and then see if it's a subjective law or something you can prove that you DIDN'T do. I suspect that you're just screwed though. An excessive noise violation doesn't count toward your total points, so you won't lose your license over it. It's more of a nuisance ticket than anything else. I'd also bet you're really not gaining much horsepower by not running any mufflers vs running some high-flow mufflers (which would keep you legal). Now, if that's an emissions ticket, you're probably just SOL.