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      11-04-2012, 11:51 AM   #3
drfrink24
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Drives: 2008 335xi
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Per your question about boost measurements, PSI is the most common number used, pounds per square inch. 14.7 PSI is the amount of weight, or force that a one by one inch column of air from sea level to the end of the atmosphere exerts on a scale. For boost, that = 0, so anything more than that baseline is higher than the atmospheric pressure.