(2) An exhaust system only meets the requirements of this section if all of the following apply:
(a) The exhaust system must be in good working order.
(b) The exhaust system must be in constant operation.
(c) The exhaust system must meet noise emission standards determined by the Department of Environmental Quality to be substantially equivalent to the following standards based upon a stationary test conducted at a distance of 25 feet in accordance with procedures established by the Department of Environmental Quality: