HI Bio , NO there are no legal noise limits prescribed in the test manual , the only requirement is for a continuous tone , not alternating / harsh or grating .
I actually have train horns under my Sprinter , fed off a 9lt air receiver filled up by a Range Rover air suspension pump . Button on gear lever , both sound
( hidden buttons ............................... work each horn independently )
50 PSI loud ................... 130 PSI doors rattle
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