Sorry about the confusion with the tune; not sure what kind of cars you came from, I have been a mustang guy for 10 years. On the older cars you could have a tune put on a chip but with the newer cars you have the computer "flashed" using a SCT Xcal. This happens by plugging the Xcal into your OBD-II port and the Xcal flashes your computer with the changes a tuner makes for you based on mods, a/f's, towing, 87/89/93 fuel. The injectors are 19lb injectors which are good for any n/a power mods you can put on the truck, if you were to s/c the truck you would need bigger injectors but they should come with the s/c. The mods I have seen are the CAI, cat back exhaust, U/D pullies, 75MM tb, Electric fans and headers.