but back to the question yes the ECU knows what size injectors should be in there, and if its not right, like in my case, it tells you are running rich, or lean if you went smaller??

98.5 Black SE ATX S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed cant afford an svt but lookin for 1 in nc