Following my SVA test score of 106db. I asked Martin at MK to mod the exhaust. He has put in a hockey stick pipe at the outlet with a smaller end.

Is there any other trick to make it less loud. I have heard that stuffing it with wire wool may work

Any suggestions?
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sacraficial sock - same job as wire wool

Changing the silencer wadding for something else might work, although I would say that E-Glass is the proper stuff and will last for ages - wire woll tends to disintegrate and get louder as well.