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Parish you are spot on in your thinking here. Sadly it falls on deaf ears on this forum most of the time.
Yes there is a substantial pressure drop as the RPMs increase. The Rotofab does improve this by about 1kPa. I looked at this immediately after I installed the Rotofab. I logged the stock drop just before I installed the Rotofab unit.
The MSD intake improves the top end substantially also in terms of pressure drop.
A differential pressure meter places along the intake would tell you where the restrictions are.
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