Tunes and Programmers
People put tunes and chips on their trucks in order to get better performance and get better fuel efficiency. They are very cheap and affordable ways of getting your truck to perform the way you want it to be. It is an easy way to gain at least 10-15 horsepower with stock drivetrain.
There are some tuners that you keep plugged into your truck, and also there are machines that you download codes to your truck's computer and every time you want to change it you plug it in.
The most popular chips are Bully Dog, Edge, DiabloSport, Superchips, and hypertech tuners.
If you want a little extra power without spending ridiculous amounts of money, then a tuner will fit the bill. If you want more options like better fuel economy, then a chip is worth the extra you pay.