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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.
link1235jeff, no your really dont need one on a stock motor if i was you i would do little up grades first pullies if your car is mass air up grade it 73mm or bigger a throttle body stuff like that i put a regulator on after i did a cam swap and bigger injectors.