Ive been looking around and cant seem to find a tuneboss ECU that would fit in a r125. Do you maybe have any links as to where to get it from?Afaik tuneboss make/made a replacement controller for the gen2. So it's a plug in replacement for the OEM, not a piggyback. Legend made a video going into some detail:
As far as I'm aware there are no piggyback/power commander ones which will work with the gen2+ as they have an o2 sensor loop (also why the malossi won't work).