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      10-08-2013, 07:20 PM   #14
FogCityM3
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Drives: M3 (E90) & Porsche GT3 RS
Join Date: Feb 2012
Location: San Francisco

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I did not tell the dealer, flashed back to stock, but BMW NA looked at the car and seemed to have zero cause for not replacing differential under warranty. As far as I know they're the only ones who can tell if there is/was a tune (regardless of flashing back).
Appreciate 0