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Message: [QUOTE="colo_dually, post: 412278, member: 6426"] The big issue here, is what is being done inside each of the runners that isn't being presented. Some vendors simply port the manifold out and open it up, others do some internal work and drive up the air velocitys (not sure how). Until the internals completely come to public knowledge, no one is going to have the answer. As for the bolts, it was tested the bolts only contribute to a 12CFM difference in airflow. Non-issue when compared to the heads limitations. This is the whole point of this thread. 1) Get to know what is available on the market. 2) Have the numbers presented. 3) Get to understand the differences. 4) (If Possible) Unmask some of these trade secrets. [/QUOTE]

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