The drop is performance is disproportionate with fan power i.e. using a 69cfm fan instead of 100 probably gives less than half the airflow. This is because smaller fans deal less well with static backpressure and BI2s have quite a bit of it (as do most rads). It's probably better to get a bigger fan and run it slow as thicker fans deal with backpressure better and the motor will probably have more torque (esp. if you use PWM to slow it instead of volt mod or rheostat).
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