The following is from a vendor called PCMFORLESS
The customer had a Procharger installed and this PCMFORLESS does "canned" tunes in the blind by customers shipping the PCM to them

The car owner now has a bunch of problems not only with engine but even the A4 transmission is not functioning correctly.

This is not only lazy tuning methods but total lack of respect for the customers cars for they turn off error codes so that owner does not known when engine is too lean, has misfires, etc
but also turns off safety features and never allows the engine to run in closed loop :

Refer to the RED content in each image which is looking at just a few of the PCM tables this vendor changed.
This engine would not have lasted long, esp since boost is around 18 PSI !

So where is this vendor located?

Since I do not visit forums I do not know where this vendor is located. You could easy find them by checking the forums they pay those kickback vendor fees to

In this case the C5 is not even in the USA where no one knows about American cars so its even tougher on car owner to get car correctly fixed and this PCMFORLESS is very aware that most of their customers are not local so nothing much customer can do to get their money back from very bad tuning or worse then cost of big repairs this tune will cause to both power and drivetrain with that amount of boost.