Intake/Pulley/Tune. We used to call that combo the "12 second Lightning in a box" kit. It will really wake up the truck. IMO, a 4# pulley is pretty safe with stock pumps, injectors and Maf. A 6#er that gets a bit questionable. Especially in colder climates. Either way you will need colder plugs with any added boost over 2#s. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.