Mass Air Meter Horsepower Level
you can use any MAF as long as it is programed into the EEC, of the MAF is closely recurved to match the EEC and Injector size.
If the computer was designed to use the IAT in the lower intake, moving it to the air filter with cause the engine to run rich.
275 HP - 55mm (Stock 88-93 Mustang)
350 HP - 70mm (Stock 94-95 Mustang)
550 HP - 75mm Pro-M Bullet
450 HP - 80mm (Stock Ford)
650 HP - Pro-M 85mm Flanged
750 HP - Pro-M 95mm Flanged
800 HP - 80mm Pro-M
1500 HP - 92mm Pro-M
I used a 75mm Pro-M Mass Air Meter that was factory calibrated to 19 lb injectors. This MAF Sensor was not too small becoming a restriction and not too large which tends to loose resolution and accuracy. I then programmed the proper parameters for 40 lb. injectors into the EEC through a custom tune.
Regarding the ACT/IAT, I did not relocate the ACT/IAT Sensor from the Intake Manifold (ACT) to the Air Filter (IAT) location. This would have required modification of the wiring harness and air filter. With my custom tune, I had the EEC programmed to properly measure the density (temperature) of the air in the existing intake manifold location.
The glory of a custom tune!
With a MAF upgrade, I believe it is required - or you will be settling for good enough