I don't see how you get "most Britons" from a survey of 1,138 people and of those only 716 people wanted limits. The bit I didn't know was new car exhaust noise limits will drop to 68db next year and whilst bikes are still at 77db. New rules this year means that aftermarket exhausts must not exceed the db of the factory fitted standard system it is replacing.
www.visordown.com

Like loud pipes? You’re in the minority
Three out of every five people responding to a recent survey say they want more noise cameras to tackle loud cars and bikes.