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Sounds like the difference between a single plane and a dual plane intake. The single will "run like a scalded cat" and make more high rpm horses. But the dual plane will have better throttle response, better low rpm power and feel better on the street.
Depending on the intakes (or heads in this case) perhaps the difference will be very marginal on the street and difficult to tell the difference between the two. Plenty of guys say their single plane intake works just fine on the street, others swear the dual plane is the ticket...
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