Is there a legal limit, or a noise pollution limit that applies to exhausts?
I'm thinking in terms of say Construction and Use, Council Noise Pollution or just ordinary PC Plod?
I'm asking for a buddy on another forum who has loud pipes on a classic car. I know there are rules to do with modifying the exhaust system on a new car to make it louder ( 6 inch nails in the back box ) but are there any hard and fast rules with decibels anywhere?