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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.
Some feel that removing the smog pump with the stock cats in place will shorten the life of the stock cats.
I'm not too sure on that, but it makes sense.