What's your favorite mod?

Just had an interesting thought for a discussion. I know a lot of you aren't new to the game, but at the same time don't wrench on your rig every day, so why not spin off of the "What did you do to your Jeep today?" thread, with a "What's your favorite mod?" thread? And don't be bashful, whether you really like the way that the fuzzy dice you bought accent your valve stem caps, or you just couldn't live without the 10,000hp nitrous motor you put in, if you thought it was a good idea, let us know.

I'll go first. My favorite mod to date is running 4.56 gears. I had a bit of trouble deciding what to go with, and finally I decided that if 4.56's were too low I'd just run bigger tires. But once I put a couple miles on them, I quickly realized that 4.56's with 35's and a straight 6 was a good call because where I may be lacking in power, I can usually make up with gear.

my favorite mod was puting lockers front and rear lets me climb things I would never think I could make.