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I have this in my GT. It works OK but I was only able to get one of the 3 visor buttons to work with the door opener. I usually like to program one to control the light and it would not work. I have a Lift Master that works on the newer frequencies. My older Lift Master remotes did not work with it either.
The standard visor has an illuminated vanity mirror. When you remove the visor attachment screws and remove the visor you will find an the wiring that powers the vanity mirror. Just unplug the original visor and plug in the new one with the homelink. I did this upgrade last summer. I don't remember it being difficult to do.