14 General Information Tampering with Noise Control System Federal law prohibits the following acts or the causing thereof: (1) The removal or rendering inoperative by any person, other than for purposes of maintenance, repair, or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or delivery to the ultimate purchaser or while it is in use; or (2) the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed to constitute tampering are the acts listed below:
Air Intake System Removing or rendering inoperative the air cleaner or intake piping. Engine Cooling Fan Removing or rendering inoperative the fan clutch. Removing the fan shroud. Engine Removing or altering engine speed pro- gramming so as to allow engine speed to exceed manufacturer’s specifications. Modifying the parameters of the Engine Electronic Control Unit.