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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 pipes will flow better at higher RPM and give you a couple more HP up top but from what I hear the X Pipes have a raspier sound to them than the H Pipes. I like my exhaust to sound nice and deep ;-)
i like the h-pipe better. thing is that h-pipe is good for low end instead top end where the x-pipe makes good power. in reality i dont see a difference in gains other than sound