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Old 07-02-2009, 12:43 PM   #7 (permalink)
ConnClark
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Join Date: Jun 2008
Location: Richland,WA
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

Gentoo320 - '04 Mercedes C320 4Matic
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Quote:
Originally Posted by Frank Lee View Post
Maybe a manometer test would reveal it's already in a low psi zone?
I kind of doubt that. The slip stream always has a lower pressure than something in the air flow. Also recent trends in car design have moved the exhaust outlet from below the bumper to a notch in the bumper or as part of back of the car to leverage this vacuum. A Porsche boxster is an example of this
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