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The Iris throttle body is interesting if used for Formula 1 but would it suit lower road engine speeds is the real issue.
the answer to that is no, the iris and roller style have a very large opening very quickly and therefor would not offer the fine control at low throttle
if your butterfly style throttle is too small for the application and therefore you are getting pressure drop... then do what everyone else is doing... put a bigger throttle body... or muck around knife edging it
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