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      08-31-2007, 08:42 AM   #2
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Drives: 07 335i e90, 09 335i e93
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Location: St. Louis, MO

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The exhaust in the middle may reduce the diffuser effect, or as you say it may be just marketing with no real effect, but the exhaust in the middle does not necessarily preclude the entire diffuser effect. In other words, I don't think you can eyeball it and conclude there is no ground effect. Just as you cannot eyeball an F-117 and say it will fly.
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