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When building your manifolds keep the log no larger than necessary. When a small primary dumps into the big pipe velocity will drop. A 3" log may be a bit large.

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Yeah,
I have been asking the same question about using the 3" for the entire hot side and was assured it would be fine. My pops and I were throwing around words about the velocity being affected.
I was thinking that since it had a bottleneck at the T6 flange the velocity would be increased due to that .