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I do not know what the real reason is that the ducts were pulled.
I would guess that a low pressure area was created by air flowing over the NASA ducts that pulled air out of instead of into the ducts. I doubt it created any instability issues. It just did not work as hoped. Sucking air out from the wheel wheel or from under the car should help stability.
This probably worked against the motors cooling fan's efforts to pull air in and through the intercoolers. The NASA ducts were pulling air and the motor's fan was pulling air. Both against each other.
If RUF had closed up much of the rear deck lid to limit air flow for only to the motor's intake, the fan would have pulled air in through the IC's in the side panels of the motor bay just like it pulls air through the intercooler on a 930's rear deck lid.
Just a guess so please do not beat me up.
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