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I know a guy with a new 25 Citation with a 496HO that just put the CMI headers on it and picked up 3 mph. I know thats a different motor and everything, but I think the 496 is more potent when adding these kinds of upgrades. I'd say you might pick up a couple mph throughout the entire rpm range but I don't think it'll be as much as 5mph.
-Tom
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