Tuner vs. Complete Kits:
Tuner kits do NOT come with injectors, MAF sensor, fuel pump or FMU, or any tuning software.
Complete kits come with everything needed to have a direct bolt on kit.
Why buy a "Tuner" kit?
Some people are after max horsepower and already have a built engine and would otherwise max out the fuel pump, injectors and MAF that comes with a complete kit, so they chose a "tuner" kit as they will be tuning their kit to what their system requires.
Complete Kits are meant for stock vehicles that will run the stock supercharger and crank pulley.