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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.
equal length= primaries are all the same length and look all wrapped around... unequal length= primaries go straight from the exhaust port to the collectors; the front pipes are longer than the rear pipes...if you go to an online store with pictures you can see the difference...
it will bolt up to the stock manifold and cat-back. the only way it wouldnt is if they were designed for longtubes or midtubes, which they would have said that they are.