Is your engine stock? I don't think it will be much unless you upgrade other parts of the engine as well. 500cfm 2v?? Wow.
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Evan
67-5.0L
http://eyrules.com/mustang.html
http://eyrules.com/images/mustang/mustang1.jpg
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Evan
67-5.0L
http://eyrules.com/mustang.html
http://eyrules.com/images/mustang/mustang1.jpg