2010 Chevrolet Silverado 1500 Regular Cab Owner's Manual - Page 498

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: . . Removal of the air cleaner silencer. Modification of the air cleaner. Removal of the muffler and/or resonator. Removal of the exhaust pipes and exhaust pipe clamps. Exhaust: . . Headlamp Aiming The vehicle has a visual optical headlamp aiming system. The aim of the headlamps have been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in a crash, the aim of the headlamps can be affected and adjustment can be necessary. If oncoming vehicles flash their high beams at you, this can mean the vertical aim of your headlamps needs to be adjusted. It is recommended that the vehicle is taken to your dealer for service if the headlamps need to be adjusted. It is possible however, to re-aim the headlamps as described. Insulation: . Removal of the noise shields or any underhood insulation. Engine: . Removal or rendering engine speed governor, if the vehicle has one, inoperative so as to allow engine speed to exceed manufacturer specifications. Removal of fan clutch, if the vehicle has one, or rendering clutch inoperative. Removal of the fan shroud, if the vehicle has one. Fan and Drive: . . 6-54