I'm sure Kerma provides custom tunes but simple exchange of stock files for tuned files via therm Qloader is not what many consider a custom tune, custom for the VIN sure.
A custom tune would require multiple logs and a lot more tweaking than exchange of files via email
Who provides that? Malone doesn't do that (unless you hand over the keys perhaps). My guess it would cost more than just flashing the ECU with the tune. My local guru will flash the Malone tune and hand the car back to you without multiple logs and testing. He does NOT have a dynomometer to test performance, so he can't really do a custom tune anyway. You can't properly do a custom tune by a seat of the pants test. A dyno is required for truly custom tuning. Does anyone get that level of tune (besides a few lucky individuals in the right place, and money to burn!!) ?? I doubt it!
What I am saying about Kerma is that the stock ECU has custom files underlying the stock tune that are dependent on the individual car, performance of the collection of individual parts. Kerma starts with your stock tune files. Isn't that true??? Most of the files on the ECU are left "as is" during a tune from any tune vendor (your stock tune on the Q Pro loader is a starting place, different than any other car). Only things like boost curve, injection volume and timing (especially!) are modified. Maybe a few other things. It is my impression that the ECUs on stock vehicles are NOT identical (many hardware performance-dependent constants and curves). Maybe just a few of the constants and curves are substantially unique, and most others are interchangeable.
Perhaps the people that do these tunes can clarify? Maybe a Malone tune does not replace most of the constants and curves either. I am sure that some of the files should not be replaced. One could reduce the urea injection volume, for instance, if you want to save urea, fill the tank less often, but that would not have an effect on the performance-just the emissions. From a users perspective, having the original tune on the Q-Pro loader to restore is a great feature to have.