Just a footnote to this..
'5.0 Mustangs and Fast Fords' recently tested an AFPR on a stock Mustang, and found that by lowering the pressure by 4-6 psi (down to 28 psi) the car actually responed with an extra couple of horsepower. It seems that the factory computer is set to supply enough fuel to prevent any chance of detonation, etc. with stock settings. In some cases, maybe a little too much fuel.
Take it for what it's worth...
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