Heya ^<^ I wouldn't say the m112 ecu can see "boost", but it can read MAP above Ambient and trim the engine by itself. I have the supercharger and bigger injectors installed and its running just fine (I need new o-rings for the injectors though I rushed and made an oopsie) on the stock m112 ecu. I have 2 codes now, EGR and SAI (exhaust gas and secondary air injection). In the near future I will be installing a piggy back but I'm loving how far I can push this ecu so far (and yes it's much faster). As for the 78mm pully I special ordered it from v-tech by contacting them through facebook.
If it makes any difference (and it probably does) its a 2002 w210 e320