The thing is.. it sounds kind of nomal.
The other thing is if one ride the bike and have an Integral helmet.. one dont hear the muffler that much, mostly the engin, and it sounds like a sewing machine.
In any way.. I put for anual inspection, the guy take it for a ride, then it sounded for me as a big thumper.
And here is some sound to listen at;
https://www.youtube.com/watch?v=dvQg8gtjzOA&ab_channel=DarekSowa