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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.
New IL emissions law. IF your car has either passed or received a waiver in 2006, or 2007 you will no longer have to be tested if your car is older than 1995. Of course it depends on where you live. I live in IL, but have lived outside the emissions test zone for 5 years. So I don't get tested either way.