I got fed up with cleaning up the white powder, that escapes from the silencer, in the engine bay, so as an experiment I discussed with one of my customers, who just happen to be a small engineering company, about the possibility of carefully removing the stainless steel outer covers and replacing the thermal insulation board and then re-assembling it, I've attached some before and after shots and although it's fairly fiddlyName:  Ferrari_01Silencer_01.jpg
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Size:  99.6 KB I'm pleased with the results .