We have been running these cans for the entire past season, we tried it out on 5 different sleds for the entire year. As far as we were informed by Wyoming forest service any where outside of Yellowstone Park there are no dba regulations. For being tuned we have tested on the sleds and thats it. If you want a can that you can rattle off numbers about to all your buddies please go get you one from one of the aftermarket companies and pay the price they sell them at. We rode Wyoming, Utah and Idaho with these cans on and never have had any issues. Three of the sleds that tested these put on well over 1000 miles with one getting almost 1700 miles last season. If you are interested please let us know, they are loud we dont deny this and I'm sorry if that doesn't work for everyone. We are just trying to help out anyone that is interested.