This is just a base calibration gen 5 L83/L86-LT1/LT4 with 8 speed auto or 7 speed manual trans.
•Add/Clean up timing maps
•Clean up maf to +/-3% for much better throttle response and fuel economy by use of wide band 
•Shift points, speeds, and pressure adapts for that sure feel gets rid of the lag and lazy shifts increases trans life by decreasing heat built up by lazy spongy factory shift calibrations
•Speedometer corrections for tires and wheel combos or gear change
•Raise rev limiters
•Raise factory speed limiter
•Adjust fan settings for aid in cooling combustion chambers
•Timing adjustment for camshafts
•GM 8 speed auto Calibration