When I finally assembled my bobber and began riding along the streets of my city, it was loud as hell.
So, I had to do something, to make it sound a little quiet.
First of all, the pipe was disassembled and properly stuffed with stone wool.
It made the sound tone deeper when idling, but at higher rpms I still was like an "1% outlaw biker"

The solution was found in the nearest DIY shop for less than 3$.
I bought table leg, made 4 slots at the end and bent them inside with a hammer to close the end of the pipe. After that I drilled 8 holes 8 mm in diameter and put this into the muffler . Fixed with 4 rivets. Voila, the sound is perfect (for me).
May be this modification affects engine perfomance, but my bike is running 145 km/hour top speed (GPS) and it's enough for me.
Tip: If you want to do the same with your silencer, start with holes of smaller diameter and fix everything with screws. When you adjust the sound to your taste, use rivets.
I hope, this will be useful to somebody.


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