Cheers Motonacio, but that's out-of-date, bit of a give-a-way when it says "NB: these limit values will be tightened from 2003" this is the point I'm trying to make. Further, as a motorcycle rev's increase so does the noise output, and there's nothing on the DOT site about that either.

The manufacturers stamp indicates a noise level at a set RPM.

It's still confusing!

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