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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.
If your running flowmasters they will and pry have held water in them,that could be the cause of the brown color(rust).
ok good to know. i have no idea what i have. I bought my car with the exhaust, and it is the nicest sounding mustang i personally have ever heard. I would give my left nut to know exactly what mods my car has