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      07-05-2017, 06:18 PM   #8
bimmer456
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Drives: 340i
Join Date: Nov 2016
Location: Pasadena, CA

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I would think running lean would improve fuel economy but is "Playing with Fire" as said earlier. The MPPSK has no effect on fuel economy or emissions, just fun factor. Perhaps the JB4 tuners can learn how to do this map to get CARB 50 state certification.
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