I've noticed a lot of people use the tie method for their fans. The weight of the fans and the performance of a Cobra don't mix well. Those cooling vanes and capillaries were not designed to contain accelerating a 3lb fan and then violently decelerating it - let alone two of them. How many car manufacturers cut corners like that? Most have shrouds to save the radiator core quite as much as to direct the air flow........
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