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I think the first step going forward would be to establish what the noise levels are for the various rev ranges ie 5000, 7000, 10,000 etc at each track you would like to ride on. For example my local track tests at 2/3 of the rev range so I know no matter what I do with a full Akra system I am never getting anywhere near passing the noise test. To get accurate readings you may need to ride out to a track. If might be a long round trip but at least you know what you are working with to start with. I’m sure clever people can then give you better options about simply swapping end cans with baffles in to reach the required level for that track.