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Mate of my in Denmark send me this link. Yes it's in Danish!
Trying to translate to my friends around the world who's Danish is a bit rusty!
1) Cheap and effective way to make a dB-killer. Made of stainless steel shavings, mounted on 3mm welding thread
2) You need: stainless steel shavings
3) Hanger of 3mm welding thread, 50-60mm wide.
4) The shavings is wrapped loosely around the hanger
5) Take a 700mm long welding thread and fold is app. 200mm in from one end
6) Place the shavings inside the folded welding thread
7) Hold the shavings with a flat hand and pull out the hanger
8) Twist the welding thread in a vise with multi-grips so it's clamps around the shavings
9) The dB-killer is now finished. Place it into the muffler so start of dB-killer is start of inlet of muffler.
10) The other end is poking outside the muffler. Bend and use a metal cable tie to secure the welding thread.
Guess the rest of the video talks for it self!