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I looked into this about 4 years ago, so I cant remember the actual figures.
A fans efficiency is rated in how much "air power" it produces to the amount of mechanical power used.
If I get the time over the next week I will look it up again and let you know. But I do remember that the porsche fan had at least 30% better efficiency than the stock T1 setup.
Also, even though certain fans are less efficient than oters, they work better in certain applications.
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