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2017 CTS-V
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Pop the hood open and you can access the screws on top of the headlights to aim them. The screw with the big plastic collar is for vertical adjustments and the other is a for the horizontal. You need to use an allen wrench to turn them.

Ideally, you should mark on the wall where light would hit if the projector of the headlight shot a beam of light from the center of the lense that was parellel to the ground. Back your CTS about 20-30 feet from the wall and turn on the headlights. Aim the lights so that where the cut off starts to step up sits right at the marks on the wall.
 

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Registered
2017 CTS-V
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1,669 Posts
Yea, I had to cover up the sign spotters on mine after I installed the HID's. I used strips of aluminum from a soda can that was sanded on both sides to get rid of the paint and plastic coating. I glued it to the shield inside the projector using high temperature gasket maker silicon so that I can remove it easily if I need to. If you use tape, make sure that it can stand extremely high temperatures.
 
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