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Sure open wheel race cars use plenums on their ITBs. They've got more money in their ITB/R&D/Intake set ups then anyone on this forum has in their entire car.
For the amount of time/money/hassle it would take to make an ITB set up work more efficiently then a large throttle bodied greddy intake manifold it just wouldn't be worth it unless you know exactly what you're doing and have all of the tools to conceptualize the plenum design before actually making one (ie computer program + know-how to use it).
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