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My N63 with BMS Stage 2 in aggressive mode was really sick. If this RaceChip thing doesn't work out for you I highly recommend the BMS.
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Retired 2016 BMW 550i xDrive MSport | 2013 BMW 550i xDrive MSport | 2012 BMW 535i xDrive | 1988 BMW 325ic | 1984 BMW 318i
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