Hello. I recently bought a Yamaha XJ 600 51J. Unfortunately, there is a problem on the exhaust in my opinion and for the following reason you don’t see the punched EG number anymore. The exhaust is ORIGINAL and has welded a sheet “adapted to the exhaust” over the entire length around it. So to speak, a coat around the old exhaust. The machine is currently in the workshop and is supposed to get TÜV on Friday. I asked the workshop master there if it is from His answer: No, that’s not a problem as long as it’s not too loud. For old motorcycles (Bj 89) something like this happens because there may not be a replacement. Conclusion: Motorcycle not too loud, so no problem with the TÜV Now I wonder what the police say about it when I am stopped. Is it allowed to make such a change/repair on original parts where the EC number is hidden or removed? MfG Drechsl i