Hey Dennis, I need help and hope maybe you can answer. 03Silverstreak is selling a SCT handheld tuner and I needed to know if I had say a 5.4 SC put in if it will still work with my engine code. There is a strong possibilty that this transplant will happen but I wanted to know before I spent the money on the tuner that it would be compatable with the new set up or not? Thanks for any help or input.