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Member Ben (not MrBen) made quite remarkable work on the plenum add-ons already however he haven't touched the outer/larger air intake.
That's one of those thing that I trust can't/cannot be 3D printed and can only be achieved using injection molding processes, if the idea behind is to improve what has been engineered by Porsche. Reason for that is inner-wall surface roughness and how this influence air velocity (i.e. turbulent env and dyn pressures).
If you have means to validate the flow and manually polish the interior of that part then this could potentially be a nice add-on to Ben's plenum mod! Are you familiar with CFD modeling?
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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