This 03 Chevy truck with 6 liter engine had Whipple 6 lb boost supercharger installed.

The kit is crappy in they supply 2 more fuel injectors that are simply installed into the airbridge and has a Whipple controller. All it does it shot that fuel into the air flow and hope for the best.
Had stock GM tune.

As results show without any PCM tune the fuel trims even for part throttle was 8% too lean and by going into WOT/boost the injectors were at 93% duty cycle so not enough fuel even with the 2 extra fuel injectors.

With the base tune you see more PEtiming, higher rev limiter and auto trannie shift RPMs, less knock, part throttle fuel trims now perfect and what owner needs to do is correct the fuel needs to change the stock 28 lb/hr injectors to like 36 lbs and/or add out smart water/methanol injection system

Once that is done then a re-tweak of tune will be done but at the least with the tune the torque increased by 33 ft/lbs and the horsepower increased by 59 HP.