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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.
Cars also like to backfire when they don't have enough backpressure. Such as running 2 inch headers with 3 inch collectors and no cats and dumps or something. An engine needs that little bit of push.