Trick Flow Specialties has teamed up with the computer experts at SCT to conceive the new Trick Flow SCT X3 EFI programmer for 1999-04 Mustangs equipped with the 4.6L Modular V-8. This pre-programmed custom tuner enables you to set up your 4.6L engine's programming for optimum performance. It allows the user to adjust fuel calibration, ignition curve, shift points, rev limit, idle rpm, and more to get performance exactly where you want it.