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Negligible when compared to the 500+ cams which make a much bigger difference in the low end. I think some folks here have the 400's and like them, but everyone I've asked (and my car, about to be sold, has the 500's) that is relatively knowledgeable says the 500's are far and away the better choice.
____________________________________________________ 1991 Aztec Red TT bought new in '91 Way back then, added JWT chip, ignition advance, Pop charger, Stainless 3pc Borla cat back; 17 in. OZ wheels Sold 1994, 88,000 miles later, still on orig clutch; what a car 1991 Charcoal Gray TT purchased 06/05 and a heck of a lot more bang than my original. 
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