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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.
The X pipe is going to give maybe 2 or 3 extra hp. The H pipe is going to sound much better though. Summitracing.com has good prices and I have never had any shipping problems from there.