To locate any leaks you may have at the joints in the exhaust or at the mufflers, try starting the bike and with some heavy gloves on, block the exhaust at the outlets and listen for a hissing. You can locate any leaks this way.
It may be better if you have a helper listen for the hissing while you block the exit of the exhaust from the mufflers.
It may be better if you have a helper listen for the hissing while you block the exit of the exhaust from the mufflers.