its got the board in it,would it be a plug in chip or something more obvious?

i just remember looking into a p8 ecu i had that used to run the engine now in my rs500,which was modded for antilag and some other bits,and that had extra bits soldered into the main board.i just want to check really,i trust the bloke who sold it to me as he didnt know i wanted to run air injectors,just curious i suppose more than anything