i have 91 dx hatch and im getting a 91 si hatch shell with harness and ecu ,i cant find anything on how hard it is to switch ecu,well what im wondering is to do my mpfi swap will the si ecu plug right into my harness??and will i still have to run wires for 2 more injectors??

 

the si computer will plug into your stock dx harness, you will have to follow directions to convert to mpfi.