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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.
A CAT back system is referring to a Catalytic converter system back exhaust like a 99 t 04. But the cats are located in a different spot on the 05 to 09's so most of the exhaust systems are referred to as a axelback which is just that, it's a exhaust system from the rear axel going back, usually including the mufflers or muffler deletes running to the exhaust tips.