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The main problem to solve would be the wiring. The homelink module will sit "somewhere near" the middle of the front bumper.
If your car did not have this as an option, then you will need the controls (near the rear view mirror and sunroof controls)
Then you will need to run the wiring from the module to the controls => this is the most challenging part.
A much simpler mod would be to add a fake/blank button in your (PSM, Sport mode row etc) and wire it up to your regular garage opener.
Or you could just get the OEM controls and wire your garage opener to it.
Someone in the 996 forum did this a few years ago and it's very discrete.
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