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Remove emblems and moldings. Escalade roof rack and Appliques. Nice set of wheels, newer OEM or aftermarket. If you want more rugged looking, all of the above with some keys, spacers, and some bilsteins.
First I would do a retrofit so that she can see at night. I wish I would have done mine sooner, huge difference. Then a 3/6 drop making it easier for the lady to get in/out of the vehicle and for groceries, we all know those can get heavy. To finish it off a nice set of wheels and some shiny chrome esky parts. Just a couple things I would do.
While not a true retrofit, purchasing Denali headlights makes this a whole lot easier. Denali headlights + hid bulbs, 2 ballasts, and a relay kit makes this plugin and play.Black flame customs is a vendor and they make them or like I and others have done you make them yourself. I ordered my retro from theretrofitsource and got everything I needed to make it myself; hid bulbs, ballast, projectors, shrouds and relay harness it's pretty much everything you need. Not an electrical hassle at all just plug and play once the headlights are done. The hassle itself if you go the route I went is fitting the shroud and projector inside the headlight. Yukon headlights I think may be a bit easier to work with fitting the projector in there, not sure you might have to ask Shawn.
http://www.tahoeyukonforum.com/forum/showthread.php?t=38408
This is what I have done to mine with pics of the retro installed as well as some output pics. Any others questions just ask.
While not a true retrofit, purchasing Denali headlights makes this a whole lot easier. Denali headlights + hid bulbs, 2 ballasts, and a relay kit makes this plugin and play.
Performance isn't quite as good as hid projectors, but they will be tons better than stock, and won't blind anyone like pnp hids on standard halogen lenses. When you feel up to it you can replace the Denali projectors with aftermarket hid projectors.