nah, an ecu will always make some power as factory always are conservative on mass produced cars, but its usually more useful to get more mods and then tune to get your money's worth.
You should be able to run the standard ITR tune on your dc2, but it won't be that precise.
Greddy emanage is only a piggyback, it only adjusts the standard ECU points and needs tuning to make any improvements, it also has limited tuning points.
The PFC is a plug & play, with a base map, so you can do more down the track. Also its a full ECU with more tunable points
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