I think the obvious one are the running boards. That will look good and be functional. The Ti trim might look good with your black paint if you do the running boards and add bigger wheels too. It would look more complete that way. The exhaust tips are a nice area to change. I do not like the downward limpness of the 3.0 tips. Cut them and weld something like the 4.6/4.8 tip on there.

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