Tips to get out of muffler citation?

[Onefast99gsx]

Purchase a decibel meter from radio shack like I did. I carry it in my glove box just in case. I got pulled over by a state trooper last year(just a verbal warning). He couldn't tell me on the spot what the legal limit was so I thinking to myself, wtf did you pull me over for! Ever since then I've been carrying it around. I emailed a trooper that I found on a Wisconsin website. He couldn't tell me meter rating either so I don't think Wisconsin has a certain decibel law. I also carry a piece of paper in the glove box to show what California's decibel law is. I figure if mine is quieter than what they limit, then I should be good. It's so many decibels at x amount of inches. It's out in the car and I don't feel like checking right now.