Last Sunday, I was pulled over 10 miles south of Hayward Wis. by a Wisconsin State Trooper for my exhauste being too loud.
I had cobbed the throttle going from a 25 MPH zone to the 45 MPH zone going south out of town. This guy followed me, three cars back, for ten miles, befor pulling me over. Probably to see if I'd do anything else exciting. Traffic was heavy, so I didn't have an opportunity to spool it up. Made one pass on a car going slower than 55, and that was enough to trip his trigger.
Recieved a written warning for a loud pipe, and speeding, with no number cited. It wasn't a "fix it ticket", but he did say that it was illeagle to modify the exhauste on any car in Wisconsin, from the stock configuration. I have 2.5" from the turbo, all the way back to the rear bumper, with a cut down Cherry Bomb glass pack where the muffler was.
All I can say is good luck with that, as just about every truck in this state has an after market duel exhauste, and there are a few trucks in this state. And my Rabbit is a heck of allot quieter than a V8 pickup truck barking through dual exhaust with turbo mufflers.