Came across this thread and thought it could use an update.
2019-2020 Silverado and Sierra 5.3L or 6.2L kits are now available in-case anyone looking for information.
There are 4 different kits available. 2 Complete kits, comes with tuning credits for the ECU and 2 Competition kits, no tuning supplied. The 5.3L and the 6.2L have their own specific systems available, in either the Complete or the Competition kits.
Click HERE to learn more about the different system.
Thank you,
Ricardo