just got back from court for my exhaust ticket. i had a muffler shop install a high flow factory looking muffler, painted it black, and took pictures as well as brought the receipt which i made sure said replace factory muffler and the judge never even asked me to see it. he asked the officer if he inspected the exhaust after i told him it said 50 state legal and the officer said no. he asked what was wrong with it then and the officer was like "it was just uh loud.. and improper" so the judge was like ok and i got off with just paying the court fees.