Hi Doogleman,
I'm actually in Jersey, Channel Islands. We have a bit of an issue here in that we don't actually get noise tested, but if the cans (or indicators or other accessories) are not OE or don't carry a BS or E mark, we get prosecuted. No opportunity to rectify or warning - court and fine.
I've been had once, but can't bear to ride a Duc that sounds like a hoover. Sad I guess, but there you go.
My intention is to bring the apparent noise level down a notch or two, so I attract a little less attention. I shall also look into "homologating" my cans with some high quality engraving.
As suggested by KeefyB, I'll try AA16, and I note the suggestion of additional steel (or glass?) wool.
Thanks again.
Spinoli