Without judging about gadtuning (I really do not know them, therefore I can and will not), in general you should be warned for 'experts' that deal with each and every type of vehicle you can bring in, and guarantee the highest thinkable gains.
Personally for chiptuning of Alfas, Jeeps, Ducatos (and info about chiptuning of some older Fiats & Lancias) I revert to info from squadra tuning from Holland.
There you can also find that there are hardware differences between euro 6b and 6d versions and different turbo's on different models, even different piston and ceankshafts for 180hp version.
Starting point therefore is: which version do you have?