I have the european MAF tuned ecu, GTX2860R and other mods, I did some pulls with both stock and stage2, i got the same power except at low RPMs of course. Also confirmed from log files.
I'm a noob at this, this is my first turbo upgrade car, but i think the DD is good, its a noticeable lack of power at low rpms(WOT), but i really don't miss the power, yet.
I think its more responsive(strong) at the lowest RPMs when the turbos are not spooled. For my kind of DD i did not use the power at low rpms with stock turbo,
i rather rev i up if i wanted to drive sporty. But i have not tested it to much so i could change my mind.
Just tested stage 4(1.35bar,300hp) today, i'm really happy with it
Pulls real good from 4500rpms, rev limit is 7500rpms.