Two aftermarket mod that I have done and really like are:
Windshield wiper shakers. Great for wet snow and also great for tree garbage - twigs leaves and such.
Another one is the Westin lighted running boards. Perfect fit and looks spectaculay.
Mountaineer package change over.
I successfully rewired my dash harness to include most of the Mountaineer package options.
The electronic overhead console, visors and rear view mirror was a near perfect fit into the headliner.
I integrated the automatic temperature control, auto headlamps, full...