This winter I have to quieten my Jota silencers, stainless copies of unknown brand. Will experiment with tube inserts picking up on the advice found here, but also interested in buying new silencers, hopefully TüV approved (part numbered?). Any recommendations? My local TüV turned a blind eye to the current pipes giving me an approval in 15 minutes, but it’s clear from reactions when on the road that sooner or later I will be stopped and then as Piet says the police will simply refer to the 84/89 dB stated in papers and probably lack of a DGM number on silencers. The more I ride the more pressure they will get from the public, you can feel the annoyance as you ride even with a muted throttle. Still using under 5000 rpm as I bed in the motor. Guess the alternative would be a new 600cc approx Aprilia or something electric!!!! Still riding, but not the same.