I have 4.6 non PI f150. I have added a vortech supercharger running about 14lbs through a custom designed mondo air-to-air intercooler. 90mm Pro-M MAS programmed for 42lb injectors, 75mm TB. I put a set of ported/polished SVO heads with Crower cams and am having problems programming it. My local shop tells me we need to take off the FMU and "de-program" Oxygen sensor and then "hard" program the chip manually through the entire RPM range. That means no feedback with changing air density or fuel flows and it makes me very nervous. Has anybody out there had to do something similar?