Ford Mustang Forum - View Single Post - How fast would a car with these upgrades actually be?
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post #6 of (permalink) Old 10-04-2011
2Manystangs
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Joined: Mar 2009
Location: Tampa
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A PI swap(stands for Performance Improvement) is the heads and intake off a 99 or later 4.6, the parts are readily available on Ebay...usually around 300 bucks
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