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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.
i passed 302 emissions just fine with my 331 with all my mods, all i did was put on my stock h-pipe with the 4 cats. i passed with flying colors. then i dropped the stock h off again and put my o/r back on