Frank,
The 75mm unit does not require a custom program according to mods. The only specialized program it needs is to determine wether you are running a stock or KKM type filter.
When I 1st ordered mine, they shipped the wrong one, calibrated to stock filter...car would ping badly above 5000rpm. I sent it back and now have it calibrated for my open-element filter. Car runs stronger than ever with the new meter. Whatever else I add, there will be no need for calibration.
FYI: Same thing happened with my 5.0 Capri about 5 years ago. I purchased Pro-M 75mm bullet and was sent one for a stock filter. The car fell on its face and would not rev over 3000rpm. I had it recalibrated and it worked great....even when I added Heads, Cam, etc.
Regards,
