if you have the DOT sticker and information you can go back to them about it. you can also point out that "too loud" is not a subjective standard that they can jsut raise whenever they want.
"too loud" is legally defined as 90db under partial load in an open area. there is a proper test procedure for it an everything.
if you don't have the DOT docs adn sticker anymore, jsut call SLP, i am sure they will be happy to provide them.
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