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      06-06-2011, 08:04 PM   #17
lgk
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Drives: 2013 M3
Join Date: Mar 2011
Location: Charlotte, NC

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93 octane, but it was high humidity and 92 degrees. However, at some point with turbos you reach the law of diminishing returns (when other mods are not done as well) but I do not know what the maximum boost the N55 turbo can hold without any other modifications
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