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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.
so are you saying you need back pressure for a 347 to run better?
Uhhh ya. So why don't you just put a 6" exhaust on in while you are at it. A good performing exhaust is a combination of low back pressure and high velocity. To much velocity equals to much back pressure and to little back pressure equals to little velocity.