Quote:
Originally Posted by CobraMarty
The '.25' is because of the large plenum partial opening by the 30x 1/4" holes in the metal divider.
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Interesting. 30 1/4" holes on a plate would work like a "resistive" (damper) element for air flow. This would dampen resonance effects.
Since the flaps are missing, they didn't want it to develop a torque reducing resonance at a lower rpm, my guess. Again explains why N52's without 3-stage intake doesn't show any dips in the torque curve.