After the dealer installed my new exhaust, I rode home and checked and found all the exhaust flange nuts loose. I had a lot of decel poping and that seem to lessen it. After 300 miles, I still have poping, some have told me it is an exhaust leak and some believe it is the tune. I would like to eliminate any exhaust leaks before I go to the dealer about their tune. So, how do you find leaks?