Off road pipes are illegal because of the EPA noise abatement legislation from the 70s. But, Congress stopped funding the EPA noise enforcement office in 82, the laws are still on the books, the idea being that it was more appropriate for states and localities to enforce their own laws. So, it pretty much depends on the level of enforcement in your communities of noise levels and inspection system.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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