you wont really gain all that much benifit fitting a grp A ecu .. only 3psi more for fuel/boost mapping and thats about it
+ they are designed to run with the water to air intercooler + the pinouts are different..
Dollars wise - save your $'s up and install something akin to a microtech MT8/autronic .. youll get ALOT better goodness in the end and have the option to swap to MAP as well ( more boost friendly )
Keep an eye out too for upcoming threads for me regarding a Plug in St185 ECU Upgrade im helping develop