I just got in the water last weekend (and back out again unfortunately) but they were really bad in the Sandusky Bay and Kelly's Island area last year. The Sandusky police have their boats parked at the Municipal Ramps in Sandusky (best around) and if they are there, they will check you. As I understand it, you have to have some kind of muffler (but there is no specification as to what constitutes a muffler, so I consider my flappers to be a muffler) and they are doing the idle DB test which has to be under 90 db. The wind has to be under 10 mph for them to do the test. They law also states that cutouts (silent choice) are illegal but the officers I have talked to say as long as you pass the 90 db test with the exhaust open, your OK. If anybody has better information, lets hear it. I have heard all kinds of stories about horrendous fines but dont know of any personally.