Done mány exhaust modes over the half century of motorbikes (and cars) and times have changed A LOT is this aspect.
Population density, traffic density, social (in)tolerance, laws and BigBrother make for almost paranoia when on wheels compared to say the seventies/eighties.
Mind, here in Spain it is a bit weird as the rules are strict, fines draconic and policing inflexible but actual enforcing is limited. So especially in the villages it is almost motoring anarchy.
In the local village over here there are 2 village plods whom live in the village. They work 40 hrs/week and again, live in the villages. That makes inforcement friendly and working hours only.
Also the Guardia Civil whom áre strict go on different patrol routine at night; for the country side basicall only on call from the neasrest city. It is audible that the local ´anarchists´ are aware
I like to tour a bit further about with day light and despite the low chance of being caught the Sword of Damocles spoils fun.
Now most mods are difficult (servo delete) to impossible (repro) to detect but loud pipes draw attention and that is twice bad: Way more chance of being pulled over and fine guaranteed.
Also, a recent development is that traffic control cameras which appear on main roads as if strewn about from aircraft arefitted out with microphones. Pass with a too loud pipe and you will get the fine home automatically. Again a non-issue in the villages but go to see a movie and you get done for sure.
Mine has the imo beautiful tear drops and those are easily available cheap. As such been playing with buying a set and cutting them open, redesign the interior with a resonance chamber.
I have the flap servos deleted and the 900cc bangs are loud enough now really. Even when I ride with the puddin´basin they are audible over wind roar.
Next is fitting the Sprint filter, moderately opening up de cover and replacing the ´1800cc´ plates with honey comb. That will no doubt add induction sound.