My buddy has a 98 gt and just put in a 03 pi motor in using his non pi computer and harness and coils. He bought a sct x3 tuner from dallas mustang and they said it would work, I dont see how it would but anyway he hooked it up and its not letting him do anything. Does anyone know of anyone trying to do this that might have any helful info. Oh yeah he took it back to dallas mustang and they sent him another one but still had the same problem!