You are a little confused. ME7.5 is much more complicated than Sti`s or Evo`s , also there is no Ecuflash here to help you
To clarify some things , Nefmoto is NOT for editing its a flashing utility. ECM Titanium is a way to edit some maps but I really really
dont recommend it.
You need Tunerpro with a good definition file for your ECU .
There are no boost maps here ,there is a PID ,Torque model .You have to read carefully the wiki and the forums.