The ECU's on these cars can not be re-mapped/flashed etc, certainly not anything which is worthwhile. H.K.S. did modify a sister board and attach it to the main unit but it's not really worth the cost and potential downsides.
Stock injectors are 360 cc, standard fueling and pump capacity is rather poor. Any increase in boost pressure requires monitoring to check for knock, idc's etc.
A bodged or modded ECU CAN NOT give more fuel as it simply can not make the standard pump flow more, it can not increase fuel pressure, it can not make the injectors bigger and it can not control anything more than stock injectors.
Piggy back units fool systems into believing that what they are seeing is not what they are actually getting.