Adding a new intake system can help you get a little extra power and mileage, so can a new less restrictive exhaust.  Usually each of these alone won’t make a noticeable difference but combining the two together could make all the difference in the world.  Giving your truck a freer flowing intake and exhaust system allows your engine to perform with better efficiency.  Installing a performance programmer will allow you to adjust fuel pressure and consumption which, when added on top of the new exhaust and intakes systems, can really get your wheels spinning.