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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 noticed a very small diference when I went to a 65MM FRPP TB, over the stock 58mm. I am glad I upgraded just because I got a killlller deal on mine($50 for the TB and a BBK EGR). Otherwise I never would have done it.