Arnie, I think something was lost in translation in our conversations.
If you were getting an overboost code, I would have said to put the primary downpipes back on, not the secondary's.
Given that you were running a piggy back, I could have said to do anything, because I really have no idea what or how piggy backs work with the Stinger ECU.
Now that you are running a tune, a tune shouldn't trigger any overboost codes... but I am willing to bet that its triggering a turbo overspeed condition. Every tune I have seen to date, has had the turbo overspeed maps written in the wrong spot. If the car just shuts off, and recovers right after that, that can only be 3 things. Air flow limits, turbo speed, fuel correction.
If you have to key cycle the ignition to get the car back to full power, then you have a critical code being set, that needs to be addressed.
I have to ask, why did you choose this company to tune your car? I have to assume its because I am an ass, but... would really like to know the reason.