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Other than changing out the air in your tires, and adjusting your mirrors, not many that I can think of... Even a can of Krylon is going to cost you a few bucks....
I have the edge with the attitude meter and the K&N FIPK. I was thinking about methanol injection. Any suggestions? I have heard these do not respond to well to nitrous, something different with these heads, over the 7.3.
I don't know about free, other than the EGR unplug, but the muffler delete is the next closest thing to free, mine on my 03' costed $35 for the muffler shop to remove the 100# paper weight, and put a piece of pipe in its place. Picked up a MPG also form this.
How about that new fangled spray on mud? It's not free, actually not even close, but a least it's stupid.
Is that for real?
List of free mods I can think of:
1. removing FX4 stickers (do in the warm sun)
2. removing PSD badges
3. removing muffler (actually feels like it increases HP, and sounds as good as a $700 system)
4. disconnecting EGR