What are your favorite modifications to your ride?

[bigblock73]

I always get inspiration and ideas from fellow car/truck owners, which leads me to this question.

What are your favorite modifications you have made to your truck?
A brief description and picture of it would be nice. Don't hold back, share your secrets!

Here are a few of mine (in no particular order), all on Yeller.

Reworked factory radio with modern internals
Freshly chromed bumpers minus the bumper bolts
Subtle body modifications (shaved cab seam, stake pockets, TG handle, door locks, mirrors)
Fuel cell