There wasn't a noise limit last year, however even where there are limits they're usually set at 105dB, which is pretty nisy, you'd have to have very loud cans indeed to fail the noise test! The only exception is Castle Coombe, who are very strict and like you to have standard cans on.
As for insurance, there are specialist companies who will insure you for a trackday, they're not cheap though! Personally I don't bother.
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