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Originally Posted by CJ_Boxster
Without increasing the plate size.. You would be just widening the outer surface and tappering it up to the plate then polishing it... While the air will flow through much smoother, you are still bottle necking the air at the plate, so im not sure how much power you can get out of it.
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Exactly, that's why I made my original comment about the larger plate.
BTW, it looks like an exchange program with the throttle body, so they're probably just reworking stock parts and adding their own throttle plate.
Also, throttle plates can be modified to be more aerodynamic when fully opened. Things like knife-edging and shaft smoothing can be done to improve flow.