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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
well when you upgrade your throttle body, maf, headers heads etc, it is neccesary to get an adjustable regulator because with those upgrades on the intake of air and exhaust of burned fuel the stock regulator and pressure won't do you much good at all, you have to accomodate the increase of intake and exhaust with an upgrade in fuel, properly tuned you will gain horsepower and gas mileage and protect your engion from damage do to running lean.
you won't feel any difference with an adjustable regulator but you can use it to tune the car for other mods once you do some that require the fuel curve to be different from stock.