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Old 07-21-2017, 02:46 PM   #4
wparsons
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I don't agree with the original hypothesis. If it were the heads out flowing the manifold, it would get choked further as RPM's increase.

The IM spacers increase runner length and shift the power lower in the RPM band.

There's also good evidence that a good header and tune totally eliminates the torque dip without going near the TB and IM.
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